dadas as massas atomicas H=1 ,C=12, O=16,Na=23, Al=27,S=32,CL=35.5,K=39,Ca=40 e N=14 determine as massas moleculares ou as massas formulas das substacias a) CaCL2 b) C9H8O4
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a)CaCl2 = 40+2×35,5=111g/mol
b)C9H8O4 = 9×12+8+4×16=180g/mol