Question

Помогите!!! Ca => CaO => Ca(OH)2 => Ca(NO3)2

Answer 1

2Сa+O2=2CaO 
CaO +H2O=Ca(OH)2 
Ca(OH)2 +2HNO3=Ca(NO3)2 +2H2O 

Answer 2

1) 2Ca+02→2CaO

2) CaO+H2O→Ca(OH)2

3)Ca(OH)2+2HNO3→Ca(NO3)2+2H20