Question

A rigid vessel contains 2.5 mol of H2(g). How many grams of hydrogen are in the vessel.

Answer 1

Answer:

5 g of H₂ are contained in the vessel

Explanation:

A typical excersise of conversion:

We determine molar mass of H₂.

This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.

Let's make the conversion of units:

2.5 mol . 2g/mol = 5 g

5 g of H₂ are contained in the vessel

Answer 2

Mass of hydrogen in the vessel = 5 grams

Number of moles:

The number of moles is defined as the given mass over molar mass.

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given:

Number of moles= 2.5 mol

To find:

Mass of hydrogen=?

Molar mass of hydrogen =2g/mol

On substituting the values in the given formula we will get:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=2.5 mol* 2g/mol\\\\\text{Given mass}=5 g$

Thus, mass of hydrogen in the vessel is 5 grams.

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