Mr(Ca(NO3)2) = 40 + 14*2 + 16*6 =164
Mr(Na2SO4) = 23*2 + 32+16*4 = 142
Mr(MgCl2) = 24 + 35,5*2 = 95
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Mr(Ca(NO3)2) = 40 + 14*2 + 16*6 =164
Mr(Na2SO4) = 23*2 + 32+16*4 = 142
Mr(MgCl2) = 24 + 35,5*2 = 95