Question

Consider the reaction below. 2H2O mc030-1. Jpg 2H2 O2 How many moles of hydrogen are produced when 6. 28 mol of oxygen form? 3. 14 mol 6. 28 mol 12. 6 mol 25. 2 mol.

Answer 1

The units for measuring ions, molecules or atoms are called moles. Water decomposes to form hydrogen and oxygen as follows:

$\rm 2 \;H_{2}O \rightarrow 2 \;H_{2} + O_{2}$

Moles of hydrogen produced will be:

Option C. 12.6 mol

The moles can be estimated as:

• The molar ratios can be written as:

2 mol $\rm H_{2}O$ : 2 mol $\rm H_{2}$ : 1 mol $\rm O_{2}$

• The proportions and theoretical values are written as:

Let the moles of $\rm H_{2}$ = X

Then,

$[\dfrac {2 \text{mol H}_{2} }{1 \text{mol O}_{2}} ] = \dfrac {\text{X mol H}_{2}}{ 6.28\; \rm mol \;\rm O_{2}}]$

From this it can be depicted that hydrogen produced is double compared to oxygen produced.

Solving further for X:

$\begin{aligned}\rm X &= \dfrac {6.28 \text{mol O}_{2} \times \text{2 mol H}_{2} }{ 1 \text{mol O}_{2}} \\\\&= 12.56 \;\text{mol O}_{2}\end{aligned}$

Therefore, 12.56 moles are produced of hydrogen.

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