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Atoms And Molecules

Question
CBSEENSC9004977

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Solution

(a) 1 mole of oxygen atoms = 16 gm

0.2 moles of oxygen atoms = 16 x 0.2 = 3.2 gm

(b) 1 mole of water molecules = 18 gm
0.5 mole of water molecules = 0.5 x 18 =9.0 gm