Stoichiometry of Reactions: Gram/Mole

Question

Nitrogen monoxide is produced by combustion in an automobile engine.  According to the following reaction, how many grams of oxygen gas are necessary to form 0.582 moles nitrogen dioxide ?

nitrogen monoxide(g) + oxygen(g)  nitrogen dioxide(g)

Answer 1

Nitrogen monoxide = NO

Oxygen = O₂

Nitrogen dioxide = NO₂

2NO + O₂ ==> 2NO₂ ... balanced equation

Using the stoichiometry of the balanced equation along with dimensional analysis, we have....

0.582 mols NO₂ x 1 mol O₂ / 2 mols NO₂ x 32 g O₂/mol O₂ = 9.31 g O₂