Question

Find the mass of: i) 8 moles of aluminium atoms

ii) 0.2 moles of oxygen atoms iii) 2 moles of water molecules​

Answer 1

Answer:

I. 216u

ii. 3.2u

III. 36u

Explanation:

as we know that a aluminum atom has the mass 27u, oxygen atom has the mass 16u and water molecule has mass 18u (16+2)u

and, mass = mole * Amu (atomic mass unit)

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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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