Răspuns:
a) C = (100*Md) / Ms =>
Md = (C*Ms) / 100
Md = (20 * 700) / 100 = 20 * 7
Md = 140g HNO3
Ma = Ms - Md = 700 - 140
Ma = 560g H2O
b) Ca(OH)2 + 2HNO3=Ca(NO3)2 + 2H2O
74g 126g
74g Ca(OH)2 ....... 126g HNO3
Xg Ca(OH)2 ........ 140g HNO3
X = 82.22g Ca(OH)2
Ms = (100*Md) / C
Ms = (100*82.22) / 40
Ms = 205.55g solutie Ca(OH)2
c) M Ca(OH)2 = 40 + 34
M Ca(OH)2 = 74 g/mol
74g Ca(OH)2 ...... 32g O
100g Ca(OH)2 .... 43.24 % O