Question

the molecular mass of calcium sulphate CaSO⁴ (O= 16u, S=32u, Ca=40u) ​

Answer 1

Answer:

Formula unit mass of CaSO

4

.2H

2

O

= (Number Calcium atoms x atomic mass of Calcium) + (Number Sulphur atoms x atomic mass of sulphur) + (Number Oxygen atoms x atomic mass of Oxygen) + (Number Water molecules x Molecular mass of water molecule)

=(1×40)+(1×32)+(4×16)+(2×18)

=40+32+64+36

=172

Formula unit mass of gypsum = 172

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