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Monica [59]
3 years ago
13

How many atoms of hydrogen are present in 2.92 g of water?

Chemistry
2 answers:
Fantom [35]3 years ago
5 0

\boxed{1.954\times 10^{23}\text{ atoms}}of hydrogen are present in 2.92 g of {{\text{H}}_{\text{2}}}{\text{O}} .

Further Explanation:

In {{\text{H}}_2}{\text{O}} , both hydrogen and oxygen are non-metals. Oxygen has six valence electrons whereas hydrogen has only one valence electron. Both share two electrons with each other and two covalent bonds are formed between oxygen and two hydrogen atoms. This bond is formed due to sharing of the electrons and therefore {{\text{H}}_2}{\text{O}} is a covalent compound.

{{\text{H}}_2}{\text{O}} is a covalent compound. So 1 mole of {{\text{H}}_2}{\text{O}} contains 1 mole of oxygen and 2 moles of hydrogen.  

The formula to calculate the moles of water is s follows:  

{\text{Moles of }}{{\text{H}}_{\text{2}}}{\text{O}}=\frac{{{\text{Given mass of }}{{\text{H}}_{\text{2}}}{\text{O}}}}{{{\text{Molar mass of }}{{\text{H}}_{\text{2}}}{\text{O}}}} .......(1)

The given mass of water is 2.92 g.  

The molar mass of water is 18 g/mol.  

Substitute these values in equation (1)

\begin{aligned}{\text{Moles of }}{{\text{H}}_2}{\text{O}}&= \left({2.92\;{\text{g}}} \right)\left({\frac{{1\;{\text{mol}}}}{{18\;{\text{g}}}}}\right)\\&={\mathbf{0}}{\mathbf{.1622}}\;{\mathbf{mol}}\\\end{aligned}

The number of molecules in 1 mol of {{\text{H}}_2}{\text{O}} is 6.022 \times {10^{23}} .

So the number of molecules in 0.1622 mol of {{\text{H}}_2}{\text{O}} is calculated as follows:

\begin{aligned}{\text{Number of water molecules}} &= \left( {0.1622\;{\text{mol}}} \right)\left({\frac{{6.022 \times {{10}^{23}}\;{\text{molecules}}}}{{1\;{\text{mol}}}}} \right)\\&={\mathbf{0}}{\mathbf{.9768 \times 1}}{{\mathbf{0}}^{{\mathbf{23}}}}\;{\mathbf{molecules}}\\\end{aligned}

Each molecule of {{\text{H}}_2}{\text{O}} has 2 atoms of hydrogen.

So the number of hydrogen atoms in 0.9768 \times {10^{23}}\;{\text{molecules}} of water is calculated as follows;

\begin{aligned}{\text{Number of atoms of hydrogen}}&=\left({\frac{{2\;{\text{atoms}}}}{{1\;{\text{molecule}}}}}\right)\times\left( {0.9768 \times {{10}^{23}}{\text{molecules}}}\right)\\&=1.954\times {10^{23}}\;{\text{atoms}}\\\end{aligned}

\mathbf{1.954}\mathbf{\times}\mathbf{10^{23}}\textbf{ atoms} of hydrogen are present in 2.92 g of {{\mathbf{H}}_{\mathbf{2}}}{\mathbf{O}}.

Learn more:  

1. Identification of ionic bonding: brainly.com/question/1603987  

2. Which is a covalent compound? brainly.com/question/2083444  

Answer details:

Grade: Senior School  

Subject: Chemistry  

Chapter: Mole concept  

Keywords: H2O, covalent compound, molar mass, atoms, hydrogen, 18 g/mol, valence electrons, 2.92 g, moles, given mass.  

Wittaler [7]3 years ago
3 0
The molecular weight of water is <span>18.01528 g/mol.
So in 2.92 grams there are 2.92/</span>18.01528 = 0.1621 mol of particles.

1 mol contains 6,02214 × 10^<span>23 particles by definition.

So the nr of H2O molecules is </span>0.1621 * 6,02214 × 10^23 = 0,9761 × 10^23.

Every molecule has 2 H atoms, so you have to double that.

2* 0,9761 × 10^23 = 1.952 × 10^23.
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6 0
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Calculate the solubility of carbon dioxide in water at an atmospheric pressure of 0.400 atm (a typical value at high altitude).A
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Answer:

The molar solubility of carbon dioxide gas is 4.662\times 10^{-6} M.

Explanation:

Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.

To calculate the molar solubility, we use the equation given by Henry's law, which is:

C_{CO_2}=K_H\times p_{liquid}

where,

K_H = Henry's constant = 3.50\times 10^{-2}mol/L.atm

p_{CO_2} = partial pressure of carbonated drink

p_{CO_2}=p\times \chi_{CO_2}

where = p = Total pressure = 0.400 atm

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p_{CO_2}=0.400 atm\times 3.33\times 10^{-4} =0.0001332 atm

Putting values in above equation, we get:

C_{CO_2}=3.5\times 10^{-2}mol/L.atm\times 0.0001332  atm\\\\C_{CO_2}=4.662\times 10^{-6} M

Hence, the molar solubility of carbon dioxide gas is 4.662\times 10^{-6} M.

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。☆✼★ ━━━━━━━━━━━━━━  ☾  

I believe the answer would be A. equal temperature

Have A Nice Day ❤    

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