Question

Calculate the mass of the following:

(a) 0.5 mole of N gas( mass from mole of molecules)

(b) 0.5 mole of N atoms (mass from mole of atoms)

(c) 3.011× 10 number of N atoms (mass from number)
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Answer 1

(a)Molar mass of N2=14×2=28

no. of moles =given mass /molar mass

0.5=given mass /28

given mass=28×0.5

=14g

(b)Molar mass of N=14g

no. of moles =given mass /molar mass

given mass=0.5×14

=7g

(c)Molar mass of N=14g

no. of atoms=given mass /molar mass ×avagadro no.

given mass=no. of atoms×molar mass /avagadro no.

=3.011×10×14/6.022×10^23

=7×10^-22

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