Question

A molecule has two nitrogen and four hydrogen atoms. If the symbols of nitrogen are 7N14 and 1H1 respectively then write its empirical formula and determine its molar mass.



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Answer 1

Given :

        A molecule has two nitrogen and four hydrogen atoms.

i.e.    Nitrogen   7N14

        Hydrogen  1H1

Explanation:

A molecule has two nitrogen and four hydrogen atoms.

When nitrogen reacts with hydrogen ammonium.

$\dispalystyle \mathbf {2N2(g) + 4H2(g) \rightarrow 2NH4(g)}$  

∴  Its empirical formula is $\dispalystyle \mathbf {NH4}$

Molar mass of Hydrohen is 1.00794 g/mol

Molar mass of Nitrogen is 14.0067 g/mol

∴ Molar mass =  1*N + 4*H

                       =  1*( 1.00794 ) + 4*( 14.0067 )

                       =  1.00794 + 56.0268

                M = 57.03474 g/mol