April 2020 1 38 Report
1. Tentukan massa rumus (Mr) dari zat berikut:
(Dik: Ar H = 1, C = 12, O = 16, Na = 23, P = 31, Cl = 35,5 ;
K = 39, Ca = 40)

a) HCl
b) H3PO4
c) Ca(OH)2
d) KClO3

2. Sempurnakan koefisien dari persamaan reaksi berikut ini:

a) Na2B4O7 à NaBO2 + B2O3
b) K3PO4 + MgCI2 à KCI + Mg3(PO4)2
c) H2SO4 + Al(OH)3 à Al2(SO4)3 + H2O
d) N2O5 à NO2 + O2

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