Answer :

Given mass of nitrogen = 56g

Molar mass of nitrogen = 14g


No. of moles of nitrogen = given mass of the element/ molar mass of the element = 56g/14g = 4 moles


Equal number of moles of all the susbtances contain equal number of molecules.


So, 4 moles of nitrogen and 4 moles of oxygen contains same no. of molecules.


Hence, mass of 4 mole of oxygen = 4 × 16g = 64 g


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