Question

(b) Calculate the molecular mass of the following:
(i) Na2SO4.10H20

Answer 1

Answer:

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Explanation:

Na2So4 is also called sodium sulphate(Na2+ and So4 2-). The molecular weight of sodium sulphate is approx 142 gm/mol. So the total mass can be calculated as-: 22.98×2+32+15.99×4=142 gm.

Answer 2

The atomic mass of Na is23amu

atomic mass of S is 32amu

atomic mass of O is 16 amu

atomic mass of H2O is 18amu

Explanation:

Formula : ( atomic mass of Na)+(atomic mass of S+4(atomic mass of O)+10(atomic mass of H2O)

putting values:(23)+(32+4×16)+(18)

:23+(32+64)+(18)

:23+96+18

:137g/mol