1.
100g m g
2Ca + O2 --> 2CaO
2x40 2x56
=> m = 100x2x56/2x40 = 140g caO
2.
100g m g
Ca + I2 --> CaI2
40 294
=> m = 100x294/40 = 735g CaI2
3.
100g m g
2H2 + O2 --> 2H2O
2x2 2x18
=> m = 100x2x18/2x2 = 90g H2O
4.
100g m g
C + O2 --> CO2
12 44
=> m = 100x44/12 = 366,67 g CO2
5.
100g m g
NH3 + HCl --> NH4Cl
17 36,5
=> m = 100x36,5/17 = 214,71 g HCl