Question

(a) Define:
(1) Molecular mass
(2) Avogadro constant.
(b) Calculate the number of molecules in 50g of CaCO3
(Atomic mass of Ca = 40 u, C = 12u and O=16u)
(c) If one mole of sodium atom weighs 23g, what is the mass (in g) of one atom of sodium?

Answer 1

Explanation:

molecular mass: the molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance

atomic mass unit[u]

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Answer 2

1. 2.

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