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 0.975 moles nitrogen dioxide ? nitrogen monoxide(g) + oxygen(g) nitrogen dioxide(g) grams oxygen gas
10.5

Answer 1

1) The balanced reaction is:

2 NO + O2 = 2 NO2

The necessary grams of oxygen are calculated:

g O2 = 0.975 mol NO2 * (1 mol O2 / 2 mol NO2) * (32 g O2 / 1 mol) = 15.6 g O2

2) The balanced reaction is:

6 HCl + Fe2O3 = 3 H2O + 2 FeCl3

The moles of water are calculated:

n H2O = 24.3 g HCl * (1 mol HCl / 36.46 g) * (3 mol H2O / 6 mol HCl) = 0.333 mol

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