Jika diketahui ArCa=40,O=16,S=32,P=31,N=14,dan H=1.tentukanlah massa molekul senyawa berikut ini : a. H2SO4 B. Ca3(PO4)2 c. Ca(NO3)2
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AndreasWatang
A. Mr H2SO4 = (2 x Ar H) + (1 X Ar S) + (4 x Ar O) = (2 x 1) + (1 x 32) + (4 x 16) = 2 + 32 + 64 = 98 g/mol b. Mr Ca3(PO4)2 = (3 x Ar Ca) + (2 x Ar P) + (8 x Ar O) = (3 x 40) + (2 x 31) + (8 x 16) = 120 + 62 + 128 = 310 g/mol c. Mr Ca(NO3)2 = (1 x Ar Ca) + (2 x Ar N) + (6 x Ar O) = (1 X 40) + (2 X 14) + (6 X 16) = 40 + 28 + 96 = 164 g/mol
= (2 x 1) + (1 x 32) + (4 x 16)
= 2 + 32 + 64
= 98 g/mol
b. Mr Ca3(PO4)2 = (3 x Ar Ca) + (2 x Ar P) + (8 x Ar O)
= (3 x 40) + (2 x 31) + (8 x 16)
= 120 + 62 + 128
= 310 g/mol
c. Mr Ca(NO3)2 = (1 x Ar Ca) + (2 x Ar N) + (6 x Ar O)
= (1 X 40) + (2 X 14) + (6 X 16)
= 40 + 28 + 96
= 164 g/mol