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Question

Which one of the following contains same number of atoms as there are in 12 grams of magnesium?

A
12 grams carbon
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B
40 grams of calcium
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C
16 grams of oxygen
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D
7 grams of carbon monoxide
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Solution

The correct option is D 7 grams of carbon monoxide
No.ofatoms =WeightMolecularWeight×NA×atomicity

NA is the Avogadro number.

12 g of magnesium corresponds to 1224=0.5 moles of magnesium. It contains 0.5NA magnesium atoms.


12 g of carbon corresponds to 1212=1 mole of carbon. It contains NA carbon atoms.

40 g of calcium corresponds to 4040=1 mole of calcium. It contains NA calcium atoms.

16 g of oxygen corresponds to 1632=0.5 moles of O2. It contains 0.5NA×2=NA atoms of O2.

7 g of CO corresponds to 728=0.25 mole of CO. It contains 0.25×2=0.5NA atoms of CO.

Hence, option D is correct.

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