An experimental cryogenic cooling loop uses a specialized fluorocarbon refrigerant. The refrigerant has a molar mass of 0.088 kg mol-1 and a specific latent heat of vaporisation of 360 kJ kg-1 at its boiling point.
During a test cycle, 75 moles75\text{ moles}75 moles of the liquid refrigerant are completely vaporised at its boiling point.
What is the thermal energy required to vaporise this amount of refrigerant?
2.4×103 J2.4 \times 10^3\text{ J}2.4×103 J
2.4×106 J2.4 \times 10^6\text{ J}2.4×106 J
2.7×107 J2.7 \times 10^7\text{ J}2.7×107 J
3.1×108 J3.1 \times 10^8\text{ J}3.1×108 J
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.