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2013-11-30T00:57:45-02:00
HCO2
H = 1g/mol
C = 12g/mol
O = 16g/mol

1+12+16+16 = 45g/mol

1mol - 45g
X mol - 20g
45x=20*
X = 20/45
X= 0,44 mol
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2013-11-30T08:41:17-02:00
HCO2
1+12+16+16 = 45g/mol
1mol ------ 45g
X       ----- 20g
45x=20x1
X = 20/45
X= 0,44 mol