A cryogenic cooling system on board an infrared space telescope uses a liquid coolant to maintain its sensors at a stable operating temperature. The coolant has a molar mass of 88 g mol-1 and a specific latent heat of vaporisation of 380 kJ kg-1.
During a transient solar heating event, 150 moles150\text{ moles}150 moles of this liquid coolant vaporises at its boiling point.
What is the energy absorbed by the coolant during this vaporisation process?
5.0×106 J5.0 \times 10^6\text{ J}5.0×106 J
5.0×109 J5.0 \times 10^9\text{ J}5.0×109 J
5.0×103 J5.0 \times 10^3\text{ J}5.0×103 J
6.5×108 J6.5 \times 10^8\text{ J}6.5×108 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.