Question

The number of S atoms in 7.3 x 10^(-3) g of CaSO4.2H2O.

Answer 1

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Answer 2

Molar mass of CaSO4.2H2O is 172.17g/mol (obtained by adding all of the individual atoms' masses)

dividing 7.3 x 10^(-3) g / 172.17g/mol gives moles
from there, since each molecule only has 1 S atom, you can stop at the previous #