Question

Calculate the molecular mass of the CuSO4 . 5H2O

Answer 1

atomic mass of H = 1 g
atomic mass of O = 16 g
atomic mass of Cu =63.5 g
atomic mass of S = 32 g

now ,
molar mass of CuSO4.5H2O = atomic mass of Cu + atom mass of S + 4× atomic mass of O +5× {2 × atomic mass of H + atomic mass of O }

= 63.5 + 32 + 4× 16 +5 (2 + 16) g

=63.5 +32 + 64 + 90 g

= 249.5 g

Answer 2

Molecular mass of CuSO4 . 5 H2O = Atomic mass of Cu + Atomic mass of S + 4 × Atomic mass of O + 5 ( 2 ×Atomic mass of H +Atomic mass of O)

We know that,

Element ==>Atomic mass

Cu =>64g

S => 32g

O => 16g

H =>1g

Now,

The molecular mass = 64+ 32+ 4×16 + 5 (1 × 2+16)

Or, The molecular mass = 64+ 32 + 64 + 90

or, the molecular mass =250 g

Hope it helps