Question

2) Determine a massa fórmula de:
a) Fosfato de Cálcio (Ca3(PO4)2]
b) Nitrato de Bário (Ba(NO3)2]
c) Carbonato de Alumínio [Al2(CO3)3]​

Answer 1

a) [Ca3(PO4)2] = 310 g/mol

Ca = 40 x 3 = 120 g/mol
P = 31 x 2 = 62 g/mol
O = 16 x 8 = 128 g/mol

b) [Ba(NO3)2] = 261 g/mol

Ba = 137 x 1 = 137 g/mol
N = 14 x 2 = 28 g/mol
O = 16 x 6 = 96 g/mol

c) [Al2(CO3)3] = 234 g/mol

Al = 27 x 2 = 54 g/mol
C = 12 x 3 = 36 g/mol
O = 16 x 9 = 144 g/mol