Question

•Calculati cantitatea de oxigen care se gaseste in:
a)7,4g Ca(OH)2
b)980g H2 SO4
c)3,1g H2 CO3​

Answer 1

Răspuns:

a) MCa(OH)1=40+2×16+2×1=74g/mol

74gCa(OH)2.........32gO

7,4gCa(OH)2..........xgO

x=7,4×32/74=calculează

b) MH2SO4 =2×1+32+4×16=98g/mol

98g H2SO4.......64gO

9,8g H2SO4.........xgO

x=9,8×64/98=calculează

c) MH2CO3=2×1+12+3×16=62g/mol

62g H2CO3.........48gO

3,1g H2CO3..........xgO

x=3,1×48/62=calculează