One mole of oxygen atom weighs 16 grams, what will be the mass (in grams) of 0.4 moles of oxygen atoms?

4 mole

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0.4 mole

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640 mole

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¹/₄ mole

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Solution

Step 1:
Molar mass of oxygen is 16 g
1 mole of oxygen atom = 16 grams
0.4 mole of oxygen atom = $0.4 \times 16 = 6.4 g$
Hence, option (B) is correct.

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