Chemistry - Ideal Gas Question with Solution | TestHub
Chemical explosions are characterised by the instantaneous release of large quantities of hot gases, which set up a shock wave of enormous pressure (up to 70,000 atm) and velocity (up to 32,000 km/h). For example, explosion of nitroglycerine (C3H5N3O9) releases four gases A, B, C and D.
n C3H5N3O9 → a A(g) + b B(g) + c C(g) + d D(g)
Assume that the explosion of 1 mol of nitroglycerine releases gases with a temperature of 1727°C and a volume of 2.9 l at 410.5 atm pressure.
When gases C and D were passed through a hot tube of powdered copper, gas C reacted to form CuO. The remaining gas, D, was collected in a third 821 ml flask and found to have mass of 1.68 g and a pressure of 1.8 atm at 27°C. How many moles each of C and D were present and what are their likely identities?
Options:
Answer:
Solution:
n(D) = 1.8 × 0.821/(0.0821 × 300) = 0.06 mol; molar mass = 1.68/0.06 = 28 g/mol ⇒ N2. n(C) = 0.07 - 0.06 = 0.01 mol; reaction with hot Cu to give CuO identifies C as O2. Hence (a).
