Răspuns:
100g.....................................164g
CaCO3 + 2HNO3 => Ca(NO3)2 + H2O
200g....................................xg
MCaCO3=30+12+3×16=100g/mol
MCa(NO3)2= 40+2×14+6×16=164g/mol
x=200×164/100=calculează
