The Claus reactions, shown below, are used to generate elemental sulfur from hyd

Question

The Claus reactions, shown below, are used to generate elemental sulfur from hydrogen sulfide. 2H_2S + 3O_2 rightarrow 2SO_3 + 2H_2O SO_2 + 2H_2S rightarrow 2S + 2H_2O How much sulfur (in grams) is produced from 21.5 grams of O_2? A) 97.0 g B) 14.4 g C) 21.5 g D) 43.1 g E) none of those Phosphoric acid can be prepared by reaction of sulfuric acid with "phosphate rock" according to the equation: Ca (PO_4)_2 + 3H_2SO_4 rightarrow 3CaSO_4 + 2H_3PO_4 Suppose the reaction is carried out starting with 129 g of Ca (PO_4)_2 and 97.4 g of H_2SO_4. Which substance is the limiting reactant? A) Ca (PO_4)_2 B) H_2SO_4 C) CaSO_4 D) H_3PO_4 E) none of these

Explanation / Answer

Q29

Oxygen coefficient for:

NH3(g) + O2(g) --> NO2(g) + H2O(g)

so...

we must balance the equation, start by balancing H:

2NH3(g) + O2(g) --> NO2(g) + 3H2O(g)

balance N

2NH3(g) + O2(g) --> 2NO2(g) + 3H2O(g)

balance O:

2NH3(g) + 7/2O2(g) --> 2NO2(g) + 3H2O(g)

multiply by 2

4NH3(g) + 7O2(g) --> 4NO2(g) + 6H2O(g)

then, the best answe is

n = 7

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