Given mass of carbon = 6g
Molar mass of carbon = 12g
No. of moles of carbon = Given mass of element/ Molar mass of element = 6g/12g = 0.5 moles
Equal number of moles of all the substances contain equal number of molecules.
So, 0.5 moles of carbon and 0.5 moles of magnesium contains same no. of molecules.
Hence, mass of 0.5 mole of magnesium = 0.5 × 24g = 12g
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