You would have to add up the atomic masses of all the compounds in the compound, making sure you include how many molecules of each are in the compound
For example, in CuSOA we have 1 molecule of Cu and S, as 4 molecules of O
The atomic masses are as follows:
Cu = 63.55 u
S = 32.065 u
O = 15.99 units
This is how we would add it up:
(Atomic mass of Cu) + (Atomic mass of S) + 4(Atomic Mass of O)
Molar mass is relatively simple to calculate, but you cannot do it with a periodic table, whether that be a physical one or a digital version. in order to find the molar mass, we must find the relative atomic masses of each element that makes up the compound. With the example copper (II) sulfate. we must find the mass of Cu, S, and O. this is where the periodic table comes in. you just look up these values! mass Cu =63.55g mass S = 32.06g Mass O = 16g The next step is to multiply the relative atomic masses by the number of that element in the compound. For instance, one mole of cu is found is this compound, one mole of s, and four moles of o. **this is found by looking at the coefficients in the formula of the compound this would mean that the mass of oxygen in this is 16 * 4 = 64g now, you can calculate the molar mass by adding all of the relative atomic masses together. molar mass = molCu(mass Cu) + molS(mass S) = molO(mass O) = 1(63.55) + 1(32.06) + 4(16) = 159.61g this can be done for any compound following the same steps
