Q. 394.7( 3 Votes )

A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh:
A. 24 g of magnesium and 6 g of carbon

B. 12 g of carbon and 24 g of magnesium

C. 20 g of magnesium and 10 g of carbon

D. 12 g of magnesium and 6 g of carbon

Answer :

6.022 × 1023 atoms of magnesium = one mole of magnesium

3.011 × 1023 atoms of magnesium = 0.5 moles of magnesium


Mass of magnesium = atomic weight x number of moles


Mass of magnesium = 24 × 0.5 = 12g


Similarly 6.022 × 1023 atoms of carbon = one mole of carbon


3.011 × 1023 atoms of carbon = 0.5 moles of carbon


Mass of carbon = atomic weight × number of moles


Mass of carbon = 12 × 0.5 = 6g

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