Question

CaSO4.2H2O
calculate the percentage of water molecules in hydrated calcium sulphate ​

Answer 1

Answer:20.93%

Explanation:

RMM=40+32+64+4+32

=172

% of water molecules=36/172*100

=20.93%

Answer 2

The percentage of water molecules in hydrated calcium sulphate ​is 20.93%.

- The molecular mass of hydrated calcium sulphate can be calculated as :

W = 40 + 32 + (16 × 4) + 2 × (1 × 2 + 16)

W = 172 gm

- Mass of water in 172 gm hydrated calcium sulphate,

w = 2 × 18

w = 36 gm

- Percentage of water = (w/W) × 100

                                    = (36/172) × 100

                                    = 20.93%