Mr(Cr2S3) = 52×2 + 32×3 = 168
Mr(BaCl2) = 137 + 35,5 × 2 = 208
Mr(Al3C4) = 27×3 + 12×4 = 129
Mr(Fe3O4) = 56×3 + 16×4 = 232
Mr(H2CO3) = 1×2 + 12 + 16×3 = 62
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Mr(Cr2S3) = 52×2 + 32×3 = 168
Mr(BaCl2) = 137 + 35,5 × 2 = 208
Mr(Al3C4) = 27×3 + 12×4 = 129
Mr(Fe3O4) = 56×3 + 16×4 = 232
Mr(H2CO3) = 1×2 + 12 + 16×3 = 62