What is the relative formula mass of: NaBr, CO2, H2S, BaSO4, Cu(NO3)2, FeCL3?

Relative formula mass Relative atomic masses can be used to find the relative formula mass of a compound. To find the relative formula mass (Mr) of a compound, you add together the relative atomic mass values (Ar values) for all the atoms in its formula. Here is one example: Find the Mr of carbon monoxide, CO. The Ar of carbon is 12 and the Ar of oxygen is 16. The Mr of carbon monoxide is 12... more

NaBr: 23 + 79.9 = 102.9 CO2: 12 + 16 + 16 = 44 H2S: 1 + 1 + 32.1 = 34.1 BaSO4: 137.3 + 32.1 + 16 + 16 + 16 + 16 = 233.4 Cu(NO3)2: 63.5 + 14 + 16 + 16 + 16 + 14 + 16 + 16 + 16 = 187.5 FeCl3: 55.8 + 35.5 + 35.5 + 35.5 = 162.3