Answer :

To determine the mass of 5.00 moles of hydrogen gas, we follow these steps:

1. Identify the Molar Mass: Hydrogen gas (H₂) consists of two hydrogen atoms. Each hydrogen atom has an approximate atomic mass of 1.01 g/mol. Therefore, the molar mass of hydrogen gas (H₂) is 2 × 1.01 = 2.02 g/mol.

2. Use the Mass Formula: The formula to find the mass from moles is:

[tex]\[
\text{Mass} = \text{Moles} \times \text{Molar Mass}
\][/tex]

3. Perform the Calculation: Multiply the number of moles of hydrogen gas by the molar mass:

[tex]\[
\text{Mass of hydrogen gas} = 5.00 \, \text{moles} \times 2.02 \, \text{g/mol} = 10.10 \, \text{grams}
\][/tex]

So, the mass of 5.00 moles of hydrogen gas is 10.10 grams.

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