## Answers

To balance a chemical equation count the number of atoms of each element on the both sides of a reaction and equalise them by adding suitable coefficients.

Balanced equation for this reaction is,

4NH3 + 3O2 ------------> 2N2 + 6H2O

4 moles of NH3 gives 2 moles of N2.

1 mole of NH3 will give 2/4 moles of N2 i.e. 0.5 moles of N2.

Number of moles = Mass/molar mass

Molar mass of NH3 =17.03 g/mol

Moles of NH3 = 38.7/17.03

= 2.27 moles

Moles of N2 formed = 2.27 × 0.5

= 1.14 moles N2.

Molar mass of N2 = 28.01 g/mol

Mass of N2 formed = 28.01 g/mol × 1.14 mol

= 31.9 grams.

Theoretical yield = 31.9 grams.

6. Percent yield = (actual yield/theoretical yield) × 100

Percent yield = (17.9/31.9)×100

= 56.11 %

Percent yield = 56.11 %

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