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Calculate the mass of the following.

a) 0.5 mole of N2 gas 

b) 0.5 mole of N atoms 

c) 3.011 × 1023 number of N atoms 

d) 6.022 × 1023 number of N2 molecules

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a) 0.5 mole of N2 gas : 

Mass of one mole of N2 gas = 28 g. (∵ Molecular wt. of N2 = 28) 

Mass of 0.5 mole of N2 gas = 28 × 0.5 = 14 g 

b) 0.5 mole of N atoms : 

Mass of one mole of N atoms = 14 g (∵ Atomic wt. of N = 14) 

Mass of 0.5 mole of N atoms = 14 × 0.5 = 7 g 

c) 3.011 × 1023 number of N atoms : 

Mass of 6.022 × 1023 number of N atoms = 14 g

Mass of 3.011 x 1023 number of N atoms = \(\frac{3.011\,\times\,10^{23}}{6.022\,\times\,10^{23}}\,\times\,14\) = 7 g.

d) 6.022 × 1023 number of N2 molecules : 

Mass of 6.022 × 1023 number of N2 molecules = 28 g

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