Question

33.Calculate

(a) The mass of one atom of oxygen

(b) The mass of one molecule of oxygen

(c) The mass of one mole of oxygen gas

(d) The mass of one ion of oxygen

(e) The number of atoms in 1 mole of oxygen molecule​

Answer 1

Answer:

(a)The mass is equal to 16

(b)O2 is a diatomic molecule. The mass of an oxygen atom = 16 amu.

(c)One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023.

(d)Mass refers to the measure of number of atoms in an element or a compound. Now, since 1 mole of oxygen atoms = 16 units and every mole of oxygen contains 6.023 × 1023 atoms, Hence, 1 oxygen ion weighs = 1/6.023 × 1023 u.

(e)One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

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