Question

What is the molar mass of copper(II) sulphate?

Answer 1

Hint: The molar mass is the mass of a given chemical element or chemical compound divided by the amount of substance. The molar mass of a compound can be calculated by adding the standard atomic masses of the constituent atoms. Molar mass is a ratio that is used to convert a mass measurement to an amount of substance.

Complete answer:
The molar mass of a compound is often calculated by adding the quality atomic masses of the constituent atoms.
-Make use of the chemical formula to determine the number of atoms of each element in the compound.
-Multiply the atomic weight of each element with its number of atoms present in the compound.
-Add up all and assign units as $ \dfrac{{gram}}{{mole}} $ .
 $ CuS{O_4} $ is composed of , $ Cu(63.55gmo{l^{ - 1}}) $ , $ S(32.06gmo{l^{ - 1}}) $ and oxygen $ (4 \times 15.999gmo{l^{ - 1}}) $
Molar mass of $ CuS{O_4} = 63.55 + 6396 + 63.96 = 159.57\dfrac{g}{{mol}} $ .

Additional Information:
The molar mass is an average of many instances of the compound, which often vary in mass due to the presence of isotopes. Most commonly, the molar mass is computed from the standard atomic weights and is thus a terrestrial average and a function of the relative abundance of the isotopes of the constituent atoms on Earth. The molar mass is appropriate for converting between the mass of a substance and the amount of a substance for bulk quantities.

Note:
Remember the molecular mass and molar mass are two different terms. The main difference between both is that molar mass gives the mass of a mole of a particular substance. Whereas molecular weight is the mass of a molecule of a particular substance. While the definition and units are different for molar mass and molecular weight, the value is the same.