Mr(KCl) = 39 + 35 = 74
Mr(Zn(OH)2) = 65 + 16*2 + 1*2 = 99
Mr(C3H7) = 12*3 + 1*7 = 43
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Mr(KCl) = 39 + 35 = 74
Mr(Zn(OH)2) = 65 + 16*2 + 1*2 = 99
Mr(C3H7) = 12*3 + 1*7 = 43