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na2so4= 2×23+32+4×16= 142u
(nh4)2c03= 2×(14+3×1)+12+3×16= 94u
mg3(po4)2= 3×24+2×(31+4×16)= 262u
mgO= 24+16= 40u
naf=23+19= 42u
cao= 40+16= 56u
h2so4= 2×1+32+4×16= 98u
SNa2