Question

Calculate the mass of the following?
i. •5 mole of Nitrogen gas.
ii. •5 mole of Nitrogen atoms.
iii. 3.011×10^23 Number Nitrogen atom.
iv. 6.022×10^23 Number of N2 atom.​

Answer 1

Explanation:

i) Molar mass of N2 is 28(since atomic weight of nitrogen is 14and for N2=14*2).

So mass of 1 mole of N2 is 28g.

Therefore mass of 0.5 mole is 28/2 =14g

ii) Number of moles (n)= weight/molecular weight

Weight = n×Molecular weight

=0.5×14

Mass=7g

iii) 3.011×10^2 no. of nitrogen atom at mass of nitrogen =14g

1 mole of nitrogen contains 6.022×10^23 atoms

14g will contains 6.022×10^23 atoms

how,

14/6.022×10^23 g contains 1 atom

∴

(14/6.022×10^23 )×3.011×10^23

=14/2

=7g of N.

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