A student has a 6.99 liters of a solution that has a molarity of 2.87 M. How many moles of solute are present in this solution? Round your answer to the nearest 0.01 and include units properly abbreviated, but NOT substance!

Answer:

Explanation:

Given that;

The initial pressure = 0.705 atm

The initial temperature = 22.0° C

The final pressure = 1.00 atm

The objective is to calculate the final temperature,

Since the change occurs adiabatically and reversibly, the final temperature can be calculated by using the thermodynamics equation:

\((\dfrac{T_2}{T_1})^r= (\dfrac{P_2}{P_1})^{r-1}\)

where;

r = 7/5 = 1.4

\((\dfrac{T_2}{22.0^0})^{1.4}= (\dfrac{1.00}{0.705})^{1.4-1}\)

\((\dfrac{T_2}{22.0^0})^{1.4}= (1.418)^{0.4}\)

\(T_2 = 22 \times 1.418 ^{^{\frac{0.4}{1.4}}\)

\(T_2 = 22 \times 1.418 ^{{0.286}\)

\(T_2 =24.31^0 \ C\)

Answer:

B

Explanation:

i just read it na, but i forgot the explanation

Answer:

A. and B.

Explanation:

Anion is negative as well as a negative ion.

(Just took the quiz)

Answer:

98.07848 grams.

Explanation:

The theoretical yield of the reaction is 1.13 g. The acid is the limiting reactant.

In a given chemical reaction, the theoretical yield can only be obtained from the balanced reaction equation. We have been given the balanced reaction equation in the question so we can work from there.

Number of moles of Cr =  0.50 g /52 g/mol = 9.6 * 10^-3 moles

Number of moles of acid =  0.75 g/98 g/mol = 7.7 * 10^-3 moles

Given that the reaction is 1:1, the limiting reactant would be the acid.

The theoretical yield is obtained from;

Number of moles of product * molar mass of product

We substitute to obtain;

7.7 * 10^-3 moles * 147 g/mole (since the reaction is 1:1)

= 1.13 g

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55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

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Answer:

The new volume of the gas is 156.25 mL.

Explanation:

According to Boyle's Law, at constant temperature and number of moles, the pressure and volume of a gas are inversely proportional.

So, we can use the following equation to solve for the new volume (V2):

P1V1 = P2V2

Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.

Substituting the given values:

(1.25 atm) x (250.0 mL) = (2.00 atm) x V2

Solving for V2:

V2 = (1.25 atm x 250.0 mL) / (2.00 atm)

V2 = 156.25 mL

Therefore, the new volume of the gas is 156.25 mL.

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Answer:

potentiol or kenetic

Explanation:

iron(II) sulfate, potassium iodide, and starch the solution will turn from yellow to blue.

iron(III) nitrate, potassium iodide, and starch will turn from yellow to blue.

Iron sulphate react with potassium iodide and starch the solution which is initially yellow in colour will turn to Blue this is because the fe3+ ion will iron will get reduced to fe2+. This takes place in an acidic solution. Here the iron will be reduced and the iodine will form a complex with starch.

Iron Nitrate react with potassium iodide and starch the solution which is initially yellow in colour will turn to Blue this is because the fe3+ ion will iron will get reduced to fe2+. This takes place in an acidic solution. Here the iron will be reduced and the iodine will form a complex with starch.

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The solution will change from yellow to blue in the presence of FeSO4, KI, and starch.

Starch and Fe(NO3)3 will change from yellow to blue.

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Answer:

The answer is A, Neutron adds only mass

Based on the titration curve, the titration is of a strong acid strong base and pH at equivalence point is 7.

The equivalence point in an acid-base titration is the point at which equal amount of acid and base have reacted.

The equivalence point in a strong acid-strong base titration is at pH 7.

In a weak acid-strong base titration, the pH is greater than 7 at the equivalence point.

In a weak base-strong acid titration, the pH is less than 7 at the equivalence point.

From the titration curve;

Therefore, the titration curve is of a strong acid strong base.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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A) Reaction intermediates are short-lived molecules that form as a result of a chemical reaction.C) Reaction intermediates are molecules that are produced as a result of a chemical reaction.

What is the molecules ?

Molecules are the smallest unit of a substance that can exist independently and has the same chemical properties as the original substance. They are made up of atoms that are connected together by chemical bonds. Molecules are the basic building blocks of all matter, and they exist in a variety of shapes and forms, including solids, liquids, and gases. Molecules can also be composed of multiple elements, such as water which is composed of two hydrogen atoms and one oxygen atom. Molecules can be found in a wide range of materials, from the air we breathe to the food we eat.

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Complete question

A) Reaction intermediates are short-lived molecules that form as a result of a chemical reaction.

B) Reaction intermediates are stable molecules that form as a result of a chemical reaction.

C) Reaction intermediates are molecules that are produced as a result of a chemical reaction.

D) Reaction intermediates are molecules that remain unchanged throughout a chemical reaction.

Once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.

Potential energy is a type of energy that is stored and depends upon the relative height of system. If its height is increased, the potential energy is also increases while on the other hand, if the body comes to the surface of the earth, its potential energy will be zero due to no height of the object. We know that potential energy is equals to product of mass, gravity and height of an object.

So we can conclude that if the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.

Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

Answer:

The most important sodium compounds are table salt (NaCl), soda ash (Na2CO3), baking soda (NaHCO3), caustic soda (NaOH), sodium nitrate (NaNO3), di- and tri-sodium phosphates, sodium thiosulfate (Na2S2O. 5H2O), and borax (Na2B4O. 10H2O)

Answer:

the abundance of non-native plants. this MAY be right.

Explanation:

i thought it would be an increase in pollution.

Answer: a) 85% of the reactants were used up

b) True

Explanation:

Percentage yield is defined as the ratio of actual yield to theoretical yield in terms of percentage. The actual yield is the amount of product obtained after the experiment and the theoretical yield is the amount of ideal product that should have been obtained.  

Formula :  

\(\text {percentage Yield}=\frac{\text {Actual Yield}}{\text {Theoretical Yield}}\times 100\)

Thus 85 % yield means 85 % of the reactants were used up to give only 85% of products.

The limiting reactant is the reactant that limits the amount of product formed and hence is completely used up after the reaction is complete. Thus the given statement is True.

Answer:

8

Explanation:

The atomic mass of an atom refers to the number of protons in the nucleus of an atom. Hence, an element with 6 valence electron mean that it has 6 electrons in its outermost shell.

The atomic Number of elements with 6 valence electrons cannot necessarily be the same, however, elements with 6 valence electrons belong to group six on the periodic table.

From the options given above, :

Atomic number of 8 :

Configuration : 2, 6

Atomic number of 10 :

Configuration : 2, 8

Atomic number of 12 :

Configuration : 2, 8, 2

Hence, only the element with atomic number of 8 has 6 valence electrons in its outer most shell, hence, the answer.

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

125°C/m

Explanation:

The difference in temperature will be:

35 - 10 = 25

The outer duct surface is heated 25°C by the air from 10°C to 35°C;

This heat gain is simply divided by 0.2m to get heat gain per unit length:

25/0.2 = 125

125°C/m

If you're American, this will be °F I believe, so the answer will be:

125°F/m

The empirical formulas of the four ionic compounds that can be formed from the given ions are NH4CN, Fe(IO3)3, NH4I, and Fe(CN)3.

Ionic compounds are formed when oppositely charged ions are attracted to each other by electrostatic forces to form a neutral compound. In this case, we have four different ions: NH^+, CN^-, IO3^-, and Fe^3+. To form an ionic compound, we need to pair up ions with opposite charges in such a way that the overall charge of the compound is neutral.

The ammonium ion (NH4^+) has a charge of +1, and the cyanide ion (CN^-) has a charge of -1. When they combine, the charges cancel out, giving a neutral compound with the formula NH4CN.

The iron(III) ion (Fe^3+) has a charge of +3, and the iodate ion (IO3^-) has a charge of -1. To balance the charges, we need three iodate ions for every iron(III) ion. Therefore, the formula for the compound is Fe(IO3)3.

The ammonium ion (NH4^+) has a charge of +1, and the iodide ion (I^-) has a charge of -1. When they combine, the charges cancel out, giving a neutral compound with the formula NH4I.

The iron(III) ion (Fe^3+) has a charge of +3, and the cyanide ion (CN^-) has a charge of -1. To balance the charges, we need three cyanide ions for every iron(III) ion. Therefore, the formula for the compound is Fe(CN)3.

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Answer:

Nitrogen (N)

Explanation:

From the question given above, the following data were obtained:

Electronic configuration of the element => 1s² 2s²2p³

Next, we shall determine the number of electrons present in the element.

Thus, the number of electrons in the element can be obtained as follow:

Number of electron = 2 + 2 + 3

Number of electron = 7

Next, we shall determine the number of protons in the element.

Since the element is neutral, the number of protons is the same as the number of electrons. Mathematically,

Number of protons = number of electrons

Number of electron = 7

Therefore,

Number of protons = 7

Finally, we shall determine the atomic number of the element.

The atomic number of an element is the number of protons in the atom of the element. Mathematically,

Atomic number = number of protons

Number of protons = 7

Therefore,

Atomic number = 7

Comparing the atomic number of the element ( i.e 7) with those in the periodic table, the name of the element is Nitrogen (N) since no two elements have the same atomic number.

These are the formal charges for compounds 1 and 2:

The formal charge of an atom is the charge that an atom would have if all of the electrons in a bond were shared equally. To calculate the formal charge of an atom, use the following formula:

formal charge = valence electrons - (bond electrons / 2) - non-bonding electrons

In compound 1, the nitrogen atom has 5 valence electrons, 3 bond electrons (one from each of the two C-N bonds), and 0 non-bonding electrons. Therefore, the formal charge on the nitrogen atom is 0.

The oxygen atom in compound 1 has 6 valence electrons, 2 bond electrons (one from each of the two C-O bonds), and 4 non-bonding electrons. Therefore, the formal charge on the oxygen atom is -1.

The chlorine atom in compound 1 has 7 valence electrons, 1 bond electron (from the C-Cl bond), and 6 non-bonding electrons. Therefore, the formal charge on the chlorine atom is -1.

In compound 2, the nitrogen atom has 5 valence electrons, 1 bond electron (from the N-O bond), and 4 non-bonding electrons. Therefore, the formal charge on the nitrogen atom is +1.

The oxygen atom in compound 2 has 6 valence electrons, 2 bond electrons (one from the N-O bond and one from the C=O bond), and 0 non-bonding electrons. Therefore, the formal charge on the oxygen atom is -1.

The carbon atoms in both compounds have 4 valence electrons, 4 bond electrons, and 0 non-bonding electrons. Therefore, the formal charge on the carbon atoms is 0.

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Answer: sound waves

Explanation: Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solid

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

6.36 m³

Explanation:

Using the general gas law

P₁V₁/T₁ = P₂V₂/T₂

Given that P₁ = 1.0 atm, V₁ = 0.8 m³ and T₁ = 20 °C = 273 + 20 = 293 K and P₂ = 0.10 atm, V₂ = unknown and T₂ = -40 °C = 273 + (-40) = 273 - 40 = 233 K

So, V₂ = P₁V₁T₂/P₂T₁

Substituting the values of the variables into the equation, we have

V₂ = 1.0 atm × 0.8 m³ × 233 K/0.10 atm × 293 K

V₂ = 186.4 atm-K-m³/29.3 atm-K

V₂ = 6.36 m³

So, the new volume of the balloon is 6.36 m³.

Answer:

Can be broken down into simpler substances.

Explanation:

Elements are made of atoms, and that is the simplest understood unit of the universe. :) nOw GiB mY 50000 points.

Answer:

Can be broken down into simpler substances

Explanation:

Because atoms cannot be created or destroyed in a chemical reaction