Answer:
For chemical reactions involving gases, gas volume measurements provide a convenient means of determining stoichiometric relationships.
Explanation:
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B and i don’t need to explain it says it there hope it helps
N2 +H2 →2 NH3
"Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3."