Question

W what is the mass of number one 0.2 mole of oxygen atoms and number 20.5 of water molecule

Answer 1

Answer: The mass of 0.2 mole of oxygen atoms is 3.2 gm and that of 20.5 moles water molecule is 369 gm

Explanation: The molecular mass of 1 mole of Oxygen atom is 16 gm. So the mass of 0.2 moles of Oxygen atom will be 0.2*16=3.2 gm.

Coming to the second part of the question, water (H2O) contains 2 molecules of Hydrogen (H) and 1 molecule of Oxygen (O). So the molecular mass of 1 mole of water molecule will be 2*1 + 1*16 = 18 gm. Calculating the mass of 20.5 moles of water is thus, 20.5*18=369 gm.

Answer 2

Question :-

What is the mass of :

(a) 0.2 mole of oxygen atoms?

(b) 0.5 mole of water molecules?

Answer :-

(a) Mole of Oxygen atoms = 0.2 mole

Molar mass of oxygen atoms = 16 g

Mass of oxygen atoms = 16 x 0.2 = 3.2 g

(b) Mole of water molecule = 0.5 mole

Molar mass of water molecules = 2 x 1 + 16= 18 g .

Mass of H2O = 18 x 0.5 = 9 g

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