how do you identify the group and period number of an element with example

Answer:

958 g is the mass of LiOH that can react with all the CO₂

Explanation:

CO₂(g) + 2 LiOH(s) → Li₂CO₃(aq) + H₂O

We think in the reaction:

1 mol of carbon dioxide can react with 2 moles of lithium hydroxide.

First of all, we convert the mass of our reactant to mol:

880 g . 1mol /44g = 20 moles

As ratio is 1:2, 20 moles of CO₂ will react with 40 moles of LiOH.

Let's determine the mass:

40 mol .  23.95 g /1mol = 958 g

Carbon dioxide, nitrous oxide, and methane are all compounds that consist of two elements

The statement "increasing the force will increase the moment" is true.

This is because the moment is a measure of the turning effect of a force on an object about a pivot point. It is defined as the product of the force and the perpendicular distance between the force and the pivot point. The unit of moment is the newton-meter (Nm) or the joule (J).When a force is applied to an object, it will produce a moment about the pivot point if the force is not acting along the same line as the pivot point. The magnitude of the moment depends on the force applied and the distance of the force from the pivot point. As the force increases, the moment also increases, provided that the distance from the pivot point remains constant. Conversely, if the force remains constant, but the distance from the pivot point increases, the moment also increases. This is because the perpendicular distance is directly proportional to the moment, meaning that a longer distance results in a larger moment.Therefore, it can be concluded that increasing the force applied to an object will increase the moment produced about a pivot point.

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Answer:

84.24 g

Explanation:

Given data:

Mass of oxygen = 75 g

Mass of Al required to react = ?

Solution:

Chemical equation:

4Al + 3O₂     →   2Al₂O₃

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 75 g/ 32 g/mol

Number of moles = 2.34 mol

Now we will compare the moles of oxygen with Al.

                         O₂         :          Al

                          3          :             4

                       2.34        :         4/3×2.34 = 3.12 mol

Mass of Al required:

Mass = number of moles × molar mass

Mass = 3.12 mol × 27 g/mol

Mass = 84.24 g

The following statement is true concerning the results of the Human Genome Project:

The Human Genome Project has raised many complicated ethical issues.

What is Human Genome?

The human genome refers to the complete set of genetic information (DNA) present in human cells. It includes both the protein-coding and non-coding regions of DNA. The human genome is made up of about 3 billion base pairs and is organized into 23 pairs of chromosomes. The study of the human genome is an important field of genetics and has many implications for understanding human biology, evolution, and disease.

The Human Genome Project was a scientific research project that aimed to identify and map all the genes in the human genome, which contains all the genetic information needed for human development and function. The project was completed in 2003 and provided a wealth of information about the structure and function of the human genome, including the location and sequence of all human genes.

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In this letter, express gratitude to your uncle, a university professor, for his invitation and congratulate him on his achievements.

Here are the steps to be followed:

By following these steps, you can write a thoughtful and appreciative letter to your uncle, expressing your gratitude for his invitation and congratulating him on his achievements.

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Answer:

\(C_2=0.21M\)

Explanation:

From the question we are told that:

Rate constant \(K=2.4 x*10^{-2} M-1 s-1\)

Temperature \(T=35^o\)

Initial concentration \(C_1=1.20M\)

Time \(T=4min=>240sec\)

Generally the equation for  second order reacion is mathematically given by

\(\frac{1}{C_2} = \frac{1}{C_1} +Kt\)

\(\frac{1}{C_2} = \frac{1}{1.2 } +2.4 * 10^{-2} *240\)

\(\frac{1}{C_2} = 4.8\)

\(C_2=0.21M\)

Answer:

FeCl₃ . 6H₂O, BRAINLIST PLZ

Explanation:

1) The chemical formula of iron(III) chloride is FeCl₃ (the oxidation number of Fe is 3+, and the oxidation number of Cl is 1-).

2) The formula that you are lookin for the hydrate is of the type FeCl₃ . n H₂O, where n is the number of water molecules per each unit formula of Fe₂O₃.

3) Find the mass of anhydrous FeCl₃ by difference:

mass of FeCl₃ = mass of the sample - mass of the water in the sample

mass of FeCl₃ = 5.49g - 2.20 g = 3.29 g

4) Convert the mass of FeCl₃ in number of moles

number of moles = mass in grams / molar mass

molar mass of FeCl₃ = 55.845 g/mol + 3×35.453 g/mol = 162.204 g/mol

number of moles = 3.29 g / 162.204 g/mol = 0.0203 mol FeCl₃

5) Convert the mass of water in number of moles:

molar mass of water = 18.015 g/mol

number of moles of water = mass in grams / molar mass = 2.20 g / 18.015 g/mol = 0.122 moles H₂O

6) Find the mole ratio of water to iron chloride:

0.122 mol water / 0.0203 mol iron chloride = 6.01 ≈ 6

Therefore, the complete formula of the hydrate is FeCl₃ . 6H₂O,

The products of the reaction are KClO3 and H2O

Let me first let you know that the reaction that you have here is a neutralization reaction. This implies that it is the kind of reaction that is acting between an acid and a base and that the result is salt and water.

HClO3 is the acid while KOH is the base. As such, we are going to see that in this case now we are going to have the formation of a solat and water in the course of the reaction as we have it here.

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Answer:

hen ,b=4-a. From. Equation (2). Then b= 3. Now,,(a)square+(b)square=1square+3square. =1+9. =10. therefore the value of a square plus bsquare is 10

Explanation:

Complete Question

The pKb values for the dibasic base B are pKb1=2.10 and pKb2=7.54. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq).

(a) before addition of any HCl (b) after addition of 25.0 mL of HCl

Answer:

a The value  is  \(pH =12.81\)

b \(pH  = 11.9\)

Explanation:

From the question we are told that

  The first pKb value  for B is \(pK_b_1  =  2.10\)

   The second pKb value  for B is \(pK_b_2  =  7.54\)

     The volume is  \(V =   50.0 mL   =\)

     The  concentration  of  B is  \([B]  =  0.60 M\)

     The concentration of \(C_A =  0.60 M\)

Generally the reaction equation showing the first dissociation of B is  

\(\ce{B_{(aq) } + H_2O _{(l)} <=> BH^+ _{(aq)}  +  OH^- _{(aq)} }\)

Here the ionic  constant for B is mathematically represented as

      \(K_i  =  \frac{[BH^+] [OH^-]}{[B]}\)

Let denot the concentration of  [BH^+]  as  z  and  since \([BH^+] =  [OH^-]\) then \([OH^-]\) is also  z

So  [B] =  0.60  -  z  

Here \(K_i\) is ionic constant for the first reaction of a dibasic base B and the value is

   \(K_i  =  7.94 *10^{-3}\)

So

      \( 7.94 *10^{-3}=  \frac{z^2}{ 0.60 - z}\)

=>   \(z^ 2 + 0.00794 z - 0.00476\)

using quadratic formula to solve this equation

     \(z = 0.0651\)

Hence the concentration of  \(OH^{-}\) is   \([OH^-] =0.0651\)

Generally  \(pOH =  -log [OH^-]\)

=>    \(pOH =  -log (0.065)\)

=>    \(pOH = 1.187 \)

Generally the pH is mathematically represented as

    \(pH = 14 - 1.187\)

      \(pH =12.81\)

Generally the volume of \(HCl\) at the second dissociation of the base B is   \( 50 mL \)

The volume of the \(HCl\) half way to the first dissociation of the base is 25mL

Now the pOH at half way to the first dissociation of the base is  

     \(pOH  =  -log(K_i)\)

=>   \(pOH  =  -log(0.00794)\)

=>   \(pOH  =  2.100\)

Generally the pH after addition of 25.0 mL of HCl is  

    \(pH  =  14 -  2.100\)\

=>   \(pH  = 11.9\)

The first dissociation's equation is as follows:

\(B(aq) + H_2O(l) \leftrightharpoons BH^{+} (aq) + OH^{-}(aq) \\\\\)

Constant of base ionization

\(\to K_{bl}=\frac{[BH^{+}][OH^{-}]}{[B]}\\\\ \to 7.94\times 10^{-3} = \frac{x\times x}{(0.95- x)} \\\\\to 7.94\times 10^{-3} = \frac{x^2}{(0.95- x)} \\\\\to x^2=7.94\times 10^{-3} (0.95-x) \\\\\to x^2=7.543\times 10^{-3} - 7.94\times 10^{-3} x) \\\\\to x^2=7.543\times 10^{-3} - 7.94\times 10^{-3} x) \\\\\to x = 0.0830\ M\\\\\)

So,

\(\to [OH^{-}] = 0.0830\ M\\\\\)

The second dissociation of the base equation is

\(BH^{+}\ (aq) + H_20\ (l) \leftrightharpoons BH_2^{2+}\ (aq) + OH^{-}\ (aq) \\\\\)

Constant of base ionization

\(\to K_{bl}=\frac{[BH^{+}][OH^{-}]}{[B]}\\\\ \to 3.2 \times 10^{-8} =\frac{y \times (0.0830+y)}{(0.0830- y)}\\\\\)

\(\to y= \frac{ 3.2 \times 10^{-8} \times (0.0830- y)}{ (0.0830+y)} \\\\ \to y= \frac{ 3.2 \times 10^{-8} \times (0.0830- y)}{ (0.0830+y)} \\\\ \to y = 3.2\times 10^{-8}\)

So,

\(\to [OH^{-}] = 0.0830\ M \\\\\to pOH = 1.08 \\\\\to pH = 14.00 - pOH = 12.92\\\\\)

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The nucleus completing the following equation is option C: ₂₄⁵⁰Cr.

This reaction is a type of radioactive nuclei decay.

Radioactive decay is the process by which unstable atomic nuclei undergo spontaneous transformations in order to achieve a more stable state. This is accomplished by the emission of particles and/or electromagnetic radiation from the nucleus. The decay may occur by several mechanisms, including alpha decay, beta decay, gamma decay, and electron capture.

In alpha decay, the nucleus emits an alpha particle, which consists of two protons and two neutrons, resulting in a daughter nucleus that has two fewer protons and two fewer neutrons than the original nucleus.

In beta decay, a neutron in the nucleus is converted into a proton and an electron, and the electron is then emitted from the nucleus as a beta particle. This results in the daughter nucleus having one more proton and one fewer neutron than the original nucleus.

In gamma decay, the nucleus emits a gamma ray, which is a high-energy electromagnetic radiation, without changing the number of protons or neutrons in the nucleus.

In electron capture, an electron from the inner shell of the atom is captured by the nucleus, and a proton in the nucleus is converted into a neutron. This results in the daughter nucleus having one fewer proton and one more neutron than the original nucleus.

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A statement which explains this change in the moon’s rising and setting times include the following: C. Earth rotates, and the moon revolves around Earth.

In Science, a Moon can be defined as the natural satellite of planet Earth and it typically shines due to the reflected light from the Sun, as it revolves around the Earth from west to east in a month (29½ days).

In Astronomy, there are four (4) Moon phases and these include the following:

Based on astronomical records and information, the rotation of planet Earth and the revolution of the Moon around planet Earth significantly influences the rising and setting times of the Moon.

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Complete Question:

A student records the rising and setting times of the moon for a month. She notices that the moon rises and sets 50 minutes later each day. She studies these data to develop an explanation for the change in time. What explains this change in the moon’s rising and setting times?

answer choices

Earth revolves around the moon.

The moon revolves around the sun.

Earth rotates, and the moon revolves around Earth.

The moon rotates on its axis, and Earth revolves around the sun.

The compound solubility which will not be affected by a low pH in solution is AgBr.

pH is a measure of the acidity or basicity of any solution and according to the pH scale 0 to 6.9 shows the acidity, 7 is neutral and 7.1 to 14 shows the basicity of any solution.

AgBr is not affected by a low pH in solution.

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The combined Gas Law equation is represented by B) P1V1 / T1 = P2V2 / T2.

The combined gas law is the law that combines Charles’s law, Gay-Lussac’s law, and Boyle’s law.

Combined gas law can be mathematically expressed as

k = PV/T

Where,

P = pressure

T = temperature in kelvin

V = volume

K  = constant (units of energy divided by temperature)

When two substances are compared in two different conditions, the law can be stated as,

P1V1/T1 = P2V2/T2

Where,

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure

V2= final volume

T2 = final temperature

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Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.

Alcohol can swiftly cross the blood-brain barrier after it is ingested, having an impact on the brain and neurological system. Depending on the quantity and frequency of drinking, alcohol's effects on the brain can range from minor disturbances in judgment and coordination to more serious consequences including loss of consciousness and, in the worst circumstances, death.

Long-term changes in brain structure and function, such as cognitive impairment and a higher chance of developing specific neurological and mental illnesses, can also result from chronic alcohol consumption.

Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.

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The structure of DNA is a double helix, consisting of two strands of nucleotides (monomers) that wind around each other in a spiral shape.

Deoxyribonucleic acid, commonly referred to as DNA, is a molecule that contains the genetic instructions for the growth, development, functioning, and reproduction of all living things.

The structure of DNA is a double helix, consisting of two strands of nucleotides (monomers) that wind around each other in a spiral shape.

Each nucleotide is made up of a sugar molecule (deoxyribose), a phosphate group, and one of four nitrogenous bases (adenine, thymine, guanine, or cytosine).

The nucleotides are connected through phosphodiester bonds between the sugar and phosphate groups.

Hydrogen bonds hold the nitrogenous bases together.

The hydrogen bonds are complementary: adenine pairs with thymine, and guanine pairs with cytosine.

The base pairs are positioned perpendicular to the helix axis, and there are approximately ten base pairs in each full turn of the helix.

The hydrogen bonds are responsible for the helical shape of DNA, but they are not strong enough to maintain the structure on their own.

In addition to hydrogen bonding, other intermolecular forces, such as van der Waals forces and hydrophobic interactions, also contribute to the stability of the double helix by holding the bases, sugar, and phosphate groups together.

The helical shape of DNA is crucial for the molecule's function in storing and transmitting genetic information.

The double-stranded structure of DNA allows for accurate replication and repair of the genetic material during cell division.

Overall, the structure of DNA is a remarkable feat of chemical engineering that allows life as we know it to exist.

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After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

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Answer:

+1

Explanation:

Na₂O₂

NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.

Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:

Na₂O₂ = 0 (oxidation number of ground state compound is zero)

2Na + 2O = 0

O = –1

2Na + 2(–1) = 0

2Na – 2 = 0

Collect like terms

2Na = 0 + 2

2Na = 2

Divide both side by 2

Na = 2/2

Na = +1

Thus, the oxidation number of sodium (Na) in Na₂O₂ is +1

Answer:

Density, \(d=24.68\ g/cm^3\)

Explanation:

Given that,

Mass of marble slab is 38.6 kg or 38600 g

The dimensions of the slab is 23 cm × 17 cm ×4 cm

We know that the density of an object is given in terms of its mass volume as follows :

\(d=\dfrac{\text{mass}}{\text{volume}}\\\\d=\dfrac{38600\ g}{1564\ cm^3}\\\\d=24.68\ g/cm^3\)

So, the density of the marble slab is \(24.68\ g/cm^3\)

Answer: The particles can move apart only if they have enough kinetic energy to overcome this force of attraction. If particles do not have enough kinetic energy to overcome the force of attraction between them, matter exists as a solid. What is particle kinetic energy? Kinetic energy is energy that an object has because of its motion. The Kinetic Molecular Theory explains the forces between molecules and the energy that they possess.

Explanation:

this is the correct answer

just down of compact bone there is spongy bone

mark me

Answer:

Elements have more energy levels, cannot pull in the electrons tightly, and have a lower ionization energy.  

Explanation:

Answer:

Acids react with most metals to form a salt and hydrogen gas. ... For example, zinc metal reacts with hydrochloric acid, producing zinc chloride and hydrogen gas.

Explanation:

To determine the original pressure of a 750 ml sample of helium (He) at 0 degrees Celsius, we can use the combined gas law, which relates the initial and final conditions of a gas sample. The combined gas law equation is:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively.

V1 and V2 are the initial and final volumes, respectively.

T1 and T2 are the initial and final temperatures, respectively.

Let's assign the given values:

P1 = unknown (original pressure)

V1 = 750 ml (initial volume)

T1 = 0 degrees Celsius (initial temperature)

P2 = 2 atm (final pressure)

V2 = 500 ml (final volume)

T2 = 25 degrees Celsius (final temperature)

Before using the combined gas law equation, we need to convert the temperatures to Kelvin scale by adding 273.15 to both T1 and T2:

T1 = 0 + 273.15 = 273.15 K

T2 = 25 + 273.15 = 298.15 K

Now we can plug in the values into the combined gas law equation:

(P1 × 750 ml) / (273.15 K) = (2 atm × 500 ml) / (298.15 K)

To solve for P1, we can cross multiply and rearrange the equation:

P1 = (2 atm × 500 ml × 273.15 K) / (750 ml × 298.15 K)

P1 = 0.924 atm

Therefore, the original pressure of the 750 ml sample of helium at 0 degrees Celsius is approximately 0.924 atm.

Answer:

Cl

Explanation:

Electronegativity is the ability of an electron to attract electrons.

Now, due to the fact that halogens need just one more electron to become stable in their outermost shell, it means all halogens are electronegative.

However, the smaller the atomic number, the bigger the charge density and thus the more electronegative.

Thus, it is the halogen element with the highest atomic number further down the periodic table that will have the least electro negativity and thus require highest amount of energy to attract other electrons.

Thus, since chlorine (Cl) has the least atomic number of 17, then it means that it will be the one that will easily accept the electrons the most from other elements. Therefore the process of transferring electrons from potassium to chlorine will take the least amount of energy.

Earthquakes and volcanoes are often found along or near boundaries of continents and oceans.

The Ring of Fire is an area around the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur due to the movement and interaction of tectonic plates. The Ring of Fire is also known as the Circum-Pacific Belt.

1. Seismologist - Scientists who study earthquakes

2. Faults - Are breaks or cracks in the rocks that make up Earth's crust.

3. Most earthquakes and volcanoes occur in Bands

4. Earthquakes and volcanoes are often Along or near boundaries of continents and oceans.

5. A fault is a break or a crack in the rocks of Earth's crust where an earthquake might take place.

7. An earthquake might cause a landslide when the ground shakes.

8. Landforms that are usually found along the boundary between plates are Mountains and Ocean trenches.

9. An earthquake is usually caused by movement along a fault.

10. According to the map, most earthquakes occur around the edges of the ocean and continental plate boundaries.

11. The Ring of Fire is an area around the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur

There are many active volcanoes in the area of the Ring of Fire.

There are many seismic faults in the area of the Ring of Fire.

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Answer:

You would need 8 eight packs of water

Explanation:

32  x  2 (seeing as this is the amount of water each person consumes)

= 64 divided by 8 (the amount of water in each pack)

= 8 eight packs of water

Answer:

The pressure and the volume are inversely related in Boyle's Law. In Kinetic theory pressure is created by the collision of particles. If the volume is greater the number of collisions and pressure will be less. So volume and pressure are inversely related if the temperature and total kinetic energy is kept constant.

Explanation:

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Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

The balanced given equation is :

2Al(s) + 3H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + 3H₂(g)

mass of Al = 4.85 g

no. of moles of Al = mass / molar mass

                              = 4.85 / 26.98

                              = 0.17 mol

2 mole of Al produce 3 mole of  H₂

0.17 moles produced =  0.255 mole of  H₂

using the formula :

PV = nRT

P = 755 torr = 0.99 atm

R = 0.82 L atm / mol K

V = nRT / P

   = (0.25 × 0.082 × 325) / 0.99

  = 6.72 L

Volume of H₂ produced = 6.72 L

Thus, Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

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