Jika Ar: Al = 27, O = 16, Ca = 40, C = 12, S = 32, K = 39, Na = 23, N = 14, tentukan Mr senyawa berikut
Jika Ar: Al = 27, O = 16, Ca = 40, C = 12, S = 32, K = 39, Na = 23, N = 14, tentukan Mr senyawa berikut!
a. Al2O3
b. CaCO3
c. CaSO3
d. K2CO3
e. NaNO3
Jawab:
a. Mr Al2O3= (2 × 27) + (3 × 16) = 102
b. Mr CaCO3= 40 + 12 + (3 × 16) = 100
c. Mr CaSO3= 40 + 32 + (3 × 16) = 120
d. Mr K2CO3 = (2 × 39) + 12 + (3 × 16) = 138
e. Mr NaNO3 = 23 + 14 + (3 × 16) = 85
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