Question

Calcule a massa molecular dos compostos abaixo:
a) H4SiO4
b) Al2(CrO4)3

Answer 1

4.1+29+4.16 =97g/mol
2.27+3.52+12.16=298g/mol

Answer 2

H4SiO4 

Mr = 1.4 + 32 + 16.4
Mr = 4+32+64
Mr = 100 g/mol

Al2(CrO4)3

Mr = 27.2 + 52.3 + 16.3.4
Mr = 54+156 + 292
Mr = 210 + 192
Mr = 302 g/mol