Question

S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O

In the above equation, how many grams of water can be made when 19.5 moles of HNO3 are consumed?

Answer 1

Answer:

117 grams H₂O

Explanation:

To find the amount, you need to (1) convert from moles HNO₃ to moles H₂O (via mole-to-mole ratio from equation) and then (2) convert from moles H₂O to grams (via molar mass from periodic table). The final answer should have 3 sig figs according the the given value (19.5).

S + 6 HNO₃ --> H₂SO₄ + 6 NO₂ + 2 H₂O

Molar Mass (H₂O): 15.999 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.015 g/mol

19.5 moles HNO₃         2 moles H₂O          18.015 grams
--------------------------  x  ----------------------  x  ----------------------  = 117 grams H₂O
                                    6 moles HNO₃           1 mole H₂O