1 How many grams of water are needed to react with 780g CaCN

1. How many grams of water are needed to react with 78.0g CaCN2?

2.How many grams of NH3 are produced from 5.19g CaCN2?

3. How many grams of CaCO3form if 157 g water react?

so 1 mole CaCN2 reacts with 3 moles water

or 80g CaCN2 reacts with 3*18g water

so 78g reacts with 3*18*78/80 = 52.65g H2O.............ANS

1 mole CaCN2 gives 2 mole NH3

80 g CaCN2 gives 17g NH3

so 5.19g gives = 1.103gm NH3................ANS

3 mole water give 1 mole CaCO3

3*18g give 100g CaCO3

so 157g water gives = 290.741 gm CaCO3.........ANS