Jawabanmu

2014-04-09T21:30:07+07:00
A. Mg
    ar Mg = 24,31 gr/mol
    n = m / ar
    1 / 24,31 = 0.041667 mol
B. Cl
    ar Cl = 35,45 gr/mol
    n = m / ar
    1 / 35,45 = 0.282 mol
C. Ca(OH)2
    ar Ca = 40, O = 16, H = 1
    n = m / mr
    2 / [(40) + 2(16+1)] = 2 / 74
                                = 0.0274 mol
D. H2O
    ar H = 1, O = 16
    n = m / mr
    2 / [2(1) + 16] = 2 / 18
                         = 0.11111 mol
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