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 B, C and D were passed through a tube of powdered Li2O, gas B reacted to form Li2CO3. The remaining gases, C and D, were collected in another 821 ml flask and found to have a pressure of 2.1 atm at 27°C. How many moles of B were present and what is its likely identity?
Options:
Answer:
Solution:
n(C+D) = 2.1 × 0.821/(0.0821 × 300) = 0.07 mol. n(B) = 0.19 - 0.07 = 0.12 mol. Reaction with Li2O to give Li2CO3 identifies B as CO2 (also 0.04 × 3 = 0.12 mol matches the balanced equation). Hence (b).
