Question

(i) State Boyle’s law. (ii) What is standard temperature and pressure?
(iii) Calculate the percentage of nitrogen in ammonium nitrate. [NH₄NO₃] [ N = 14, H = 1, O = 16]

Answer 1

Boyle's law ; STP = 0 degree C and 1 Atm ; Percentage of nitrogen = 35%

Explanation:

(i) Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.

P1V1 = P2V2

(ii) Standard temperature and pressure (STP) refers to nominal conditions in the atmosphere at sea level.  

Standard temperature is defined as zero degrees Celsius (0C), which translates to 32 degrees Fahrenheit (32F) or 273.15 degrees kelvin (273.15K). Standard Pressure is 1 Atm, 101.3kPa or 760 mmHg or torr.  

(iii) Given ammonium nitrate and atomic mass as NH₄NO₃,  N = 14, H = 1, O = 16.

Molar mass of ammonium nitrate = 2*N + 4*H + 3 * O = 28 + 4 + 48 = 80

The percentage of nitrogen in ammonium nitrate will be 28 / 80 * 100 = 35%

Answer 2

Answer:

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