Question

1. The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In the first step of the Ostwald process, ammonia is reacted with oxygen gas to produce nitric oxide and water. What is the maximum mass of H2O that can be produced by combining 67.1 g of each reactant?

2. In the following reaction, how many grams of sodium sulfate, Na2SO4, will be produced from 80.7 g of sodium hydroxide, NaOH?

Answer 1

1) ostwald reaction

4 NH3 + 5 O2 -----------------> 4 NO + 6 H2O

4 x 17g    5 x 32 g                                 6 x 18g

68g           160g                                      108g

67.1g          67.1g                                    ?

here limiting is   O2

so

160 g O2 will give -----------------> 108 g H2O

67.1 g O2 will give --------------------> ???

H2O weight = 108 x 67.1 / 160

                    = 45.29g

mass of H2O produced = 45.29g

2)

Na2SO4 + 2 H2O ----------------------> 2 NaOH + H2SO4

142g                                                    2 x 40

142g Na2SO4 will produce ---------------> 80 g of NaOH

howmany g Na2SO4 will give-------------> 80.7 g NaOH

Na2SO4 weight = 142 x 80.7 / 80

                          = 143.24g

Na2SO4 weight = 143.24 g