Mass of hydrated copper sulfate in CuSo4.5H2O​

Molar mass of is 249.68 g/mol.

Explanation:

Molar mass is the mass of 1 mole of the molecule. It is calculated by adding masses of all the atoms in the given molecule.

contains one atom of copper , 1 atom of sulphur, 9 atoms of oxygen and 10 atoms of hydrogen

Mass of copper = 63.5  g/mol

Mass of sulphur =  32.06 g/mol

mass of oxygen = 16.00 g/mol

Mass of hydrogen = 1.008 g/mol

 Thus mass of = 63.5(1)+32.06(1)+16.00(9)+1.008(10)=249.68 g

Molar mass of is 249.68 g/mol.

b is the correct answer

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