Question

How many moles of hydrogen would be required to produce 5.0 mol of water?

Answer 1

Formula for water is H20 and there are 5 mol water. 2 mol of hydrogen per 1 mol water so 5 mol of water times 2 mol hydrogen will give you 10 mol of hydrogen.

Same process with oxygen except 1 mol of oxygen per mol of water. So 5 mol water times 1 mol of oxygen will give you 5 mol of oxygen.

Answer 2

Moles are the ratio of the mass in gm and the molar mass in gm/mol of the substance. The moles of hydrogen required to produce 5.0 mol of water is 5 moles.

What are moles?

Moles is the unit for the calculation of small entities like molecules or atoms in a compound.

The reaction between hydrogen and oxygen can be shown as,

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

From the reaction above the stoichiometry coefficient can be given as,

2 moles of hydrogen = 2 moles of water molecules

So, x moles of hydrogen = 5 moles of water

Solving for x:

$\begin{aligned} \rm x &= \dfrac{2 \;\rm moles \times 5\;\rm moles}{2\;\rm moles}\\\\&= 5\;\rm moles\end{aligned}$

Therefore, 5 moles of hydrogen is required for the production of the 5 moles of water.

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