Question

The percentage by weight of O2 in CaSO4 ( O = 16, S = 32, Ca = 40) is: the answer is 47.2 somebody send steps

Answer 1

Answer:

Formula unit mass of CaSO4.2H2O

= (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