The compound diborane can be used as a rocket propellant. What is the percent composition of boron in diborane (B2H6)?
Α.22%
Β.25%
C.39%
D.75%
E.78%

Answer:

6.36  g AgCl

Hope this helps!

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Hey there!

Molar mass NaCl = 58.44 g/mol

58.44 g ----------------- 22.4 ( at STP )

3.2 g -------------------- Volume ??

Volume = ( 3.2 x 22.4 )  / 58.44

Volume = 71.68 / 58.44

Volume = 1.226 L

Hope this helps!

Answer:

V = 0.56 L

Explanation:

Given data:

Mass of NaCl = 3.2 g

Volume of chlorine gas = ?

Pressure and temperature = standard

Solution:

Chemical equation:

2NaCl    →     2Na + Cl₂

Number of moles of NaCl:

Number of moles = mass/molar mass

Number of moles = 3.2 g/ 58.44 g/mol

Number of moles = 0.05 mol

Now we will compare the moles of NaCl with chlorine;

              NaCl       :          Cl₂

                 2          :           1

                0.05      :       1/2×0.05 = 0.025 mol

Volume of chlorine:

PV = nRT

V = nRT/P

V = 0.025 mol × 0.0821 atm.L/mol.K × 273 K / 1 atm

V = 0.56 L

Atoms like Nitrogen, Oxygen and fluorine are directly attached to hydrogen in the hydrogen bonding because there highly electronegative or contains one or more lone pair of electron.

Hydrogen in the acidic form has an atom attached to it that works as a conjugate acid.

Generally the items like oxygen fluorine and nitrogen are attached to hydrogen.

In order to attach to hydrogen to form the hydrogen bonding. The items should have high electronegativity or it should have one or more than one pair of lone pair electrons.

The Lone pair electrons get donated in the process to add to the acidic properties of the conjugate acid.

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Answer:

1) first order

2) second order

3) zero order

Explanation:

The curve of a first order reaction shows it to be exponential. In fact for a first order reaction, the concentration at a time t is an exponential function;

[A]t= [Ao] e^-kt

Where

[A]t = concentration at time =t

[Ao]= initial concentration

k= rate constant

t= time

For a second order reaction, the rate of reaction is directly proportional to the concentration of reactants.

For zero order reactions, rate of reaction is independent of concentration hence rate = k(rate constant)

The concentration data has been required for the determination of the rate of reaction. Based on the concentration of reactant and product, the rate has been determined.

1. For the first-order reaction, there has been an exponential increase in the rate of the reaction with the increase in the reactant concentration. The rate has been dependent on the concentration of the reactant.

Thus the correct option is A.

2. Irrespective of the first-order kinetic, in the second-order reaction, the rate of reaction has been directly proportional to the concentration of the reactant in the solution.

Thus option B is correct.

3. The zero-order reaction has been independent of the concentration of the reactant. The rate of reaction has been constant with an increase in the reactant concentration.

Thus option C is correct.

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Total, 0.0137 moles of carbon dioxide gas is produced when 2.3 g of sodium bicarbonate decomposes to produce carbon dioxide and sodium hydroxide.

To determine the number of moles of carbon dioxide gas produced, we first need to find the balanced chemical equation for the reaction;

2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

From this equation, we can see that for every 2 moles of sodium bicarbonate, 1 mole of carbon dioxide is produced.

Next, we need to calculate the number of moles of sodium bicarbonate in 2.3 g using its molar mass;

molar mass of NaHCO₃ = 84.0066 g/mol

moles of NaHCO₃ = mass/molar mass

= 2.3 g / 84.0066 g/mol = 0.0274 mol

Finally, we can use the mole ratio from the balanced equation to find the number of moles of carbon dioxide produced;

moles of CO₂ = (0.0274 mol NaHCO₃) x (1 mol CO₂ / 2 mol NaHCO₃)

= 0.0137 mol CO₂

Therefore, 0.0137 moles of carbon dioxide gas is produced.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Answer:

D

Explanation:

D for ducked i d k l o l but thats the most logical answer

Answer:

a. The Zn and HCl both retained their identity.

Answer:

8.8 moles of hydrogen atoms will be needed or 4.4 moles of H2 to form 4.4 moles of H2O

Explanation:

Make sure to keep stoichiometry in mind!

Answer:

HCl is not a catalyst because these are not used up during the chemical reactions.

Explanation:

Hello there!

In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.

Best regards!

Answer:

Most probably it's true.

Explanation:

Step (1) : find number of moles of (CH3OH)

\(moles = \frac{number \: of \: molcule}{6.022 \times {10}^{23} } \\ = \frac{9.56 \times {10}^{24} }{6.022 \times {10}^{23}} \\ = 15.8\)

Step (2): find mass of (CH3OH)

\(mass \: = moles \times molecules \: mass \: of \:(CH3OH) \\ = 15.8 \times 32.04 \\ = 506.2g\)

Ao, answer is 506.2 g (approx 506g)

Answer:Frogs breathe through gills underwater to get oxygen and when frogs are adults they breathe through their lungs to get oxygen.

Explanation:

Balanced net ionic equation for this reaction is : Zn(s) + 2Ag⁺(aq) -> Zn²⁺(aq) + 2Ag(s)

Solid electric conductor that carries electric current into the non-metallic solids, liquids, gases , plasmas or vacuums is called a electrode.

To set up the cell, you will need:

Zn electrode (solid zinc metal) in 1.0 M aqueous Zn⁺ solution on left side

Ag electrode (solid silver metal) in 1.0 M aqueous Ag+ solution on right side

Salt bridge (such as a U-shaped tube filled with a solution of KCl or NaCl)

To set up the cell, connect the Zn electrode to negative (-) terminal of voltmeter and the Ag electrode to positive (+) terminal of voltmeter. Then, connect two electrodes with salt bridge.

Balanced net ionic equation for this reaction is: Zn(s) + 2Ag⁺(aq) -> Zn⁺(aq) + 2Ag(s)

This reaction involves oxidation of zinc (Zn) at Zn electrode, where Zn atoms lose electrons and form Zn⁺ ions: Zn(s) -> Zn²⁺(aq) + 2e⁻

Electrons flow through the external circuit to Ag electrode, where Ag⁺ ions are reduced to solid Ag atoms, gaining electrons: 2Ag⁺(aq) + 2e⁻ -> 2Ag(s)

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Answer:

Nuclear properties

Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.

Explanation:

hope this helps if not let me know

Answer:

There are  5.0  moles hydroxide ions in  2.5  moles magnesium hydroxide.

Explanation:

The chemical formula  Mg(OH)2, indicates that there are two moles of hydroxide ions in each mole of the compound.

To determine the number of hydroxide ions in  2.5 mol Mg(OH)

2, multiply the moles of the compound by

\(2.5mol Mg(OH){2} X\frac{2 mol OH^{-} }{1mol Mg(OH){2} } = 5.0 mol OH^{-}\)

Hope it helps!!

make it the brainlist answer please

By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.

By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.

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Answer: \(Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O\)

Explanation:

Neutralization is a chemical reaction where an acid reacts with a base to form salt and water.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

The balanced chemical equation will be:

\(Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O\)

Thus the reactants are calcium hydroxide \((Ca(OH)_2\) and hydrochloric acid \((HCl)\)

Answer:

heightens

Explanation:

Answer:

8

Explanation:

Answer:

T2+500k - 273 = 223 *C

Explanation:

Answer:

It's True.

Explanation:

Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object). There are four states of matter, solid, liquid, gas, and plasma.

Answer:

sub my channel pls

Explanation:

CoolBoiAmeen

Answer: twice the momentum

Explanation:

Answer:

D

Explanation:

Answer:

C they have different frames of reference

Explanation:

Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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The molarity of the HNO3 solution is 0.463 M.

To determine the molarity of the HNO3 solution, we can use the stoichiometry of the balanced chemical equation and the volume and molarity of the Ca(OH)2 solution used.

From the balanced equation, we can see that the stoichiometric ratio between HNO3 and Ca(OH)2 is 2:1. This means that for every 2 moles of HNO3, 1 mole of Ca(OH)2 is required to reach the equivalence point.

Given that the volume of the Ca(OH)2 solution used is 31.27 mL and its molarity is 0.167 M, we can calculate the number of moles of Ca(OH)2 used:

moles of Ca(OH)2 = volume (in liters) x molarity

= 0.03127 L x 0.167 mol/L

= 0.0052169 mol

Since the stoichiometric ratio is 2:1, the number of moles of HNO3 used is twice that of Ca(OH)2:

moles of HNO3 = 2 x moles of Ca(OH)2

= 2 x 0.0052169 mol

= 0.0104338 mol

Now we need to calculate the molarity of the HNO3 solution using the volume of the HNO3 solution used, which is 22.5 mL:

molarity of HNO3 = moles of HNO3 / volume (in liters)

= 0.0104338 mol / 0.0225 L= 0.463 M

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