Question

0.5 moles of O2 gas (mass from moles of moles of molecule) full explanation
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Answer 1

Answer: A mole is defined as the amount of a substance that contains exactly 6.02214076 X1023 elementary entities of the given substance. A mole of a substance is referred to the mass of a substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C.

(a) Mass of one mole of oxygen atoms = 16 g

Then, the mass of 0.2 mole of oxygen atoms = 0.2 x 16g = 3.2 g

(b) Mass of one mole of water molecule = 18 g

Then, the mass of 0.5 mole of water molecules = 0.5 x 18 g = 9 g