Project ForgeA saturated solution at 30°C contains 5 moles of solute (M.W.=50kg/kmol) per kg of solvent (M.W.=20kg/kmol). The solubility at 100°C is 10 moles of the solute per kg of the solvent. If 10kg of the original solution is heated to 100°C, then the weight of the additional solute that can be dissolved in it, is
- A0.25 kg
- B1 kg
- 2 kg
- D3.34 kg
Explanation
Original solution: 5mol×50kg/kmol=250g solute per 1000g solvent, i.e. 1250g total solution is 20% solute, 80% solvent. 10kg (10000g) of this solution contains 2000g (2kg) solute and 8000g (8kg) solvent. At 100°C, solubility=10mol×50=500g solute per kg solvent, so 8kg solvent can hold 8×0.5=4kg solute total. Additional solute dissolvable=4−2=2kg.
Source: GATE CH 2010 (2010)
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