Find the molecular formula of ammonia, if its density at the pressure of 780 mmHg and the temperature of 20^@C is 0.736 kg//m3.

Find the molecular formula of ammonia, if its density at the pressure

1.	Find the molecular formula of ammonia, if its density at the pressure of 780 mmHg and the temperature of 20^@C is 0.736 kg//m3.
Answer» Solution :First find the molar mass of ammonia: `M = rho RT//p = 17` kg/kmole Noting that the atomic masses of the ELEMENTS which make up ammonia are `M_1 = 14` kg/kmole (nitrogen) and `M_2= 1` kg/kmole (HYDROGEN), we obtain the equation `M = x_1 M_1 + x_2M_2,` i.e. `17 = 14x_1 + x_2` Its solution in integral NUMBERS is: `x_1= 1 , x_2 = 3`.Hence the molecular formula of ammonia is `NH_3`.

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Find the molecular formula of ammonia, if its density at the pressure of 780 mmHg and the temperature of 20^@C is 0.736 kg//m3.

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