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ANSWER ALL QUESTIONS 7-12 or don’t bother
7. If 25.0 mL of 1.50 M CuSO4 is diluted to 250.0 mL with pure water, what is the molar concentration of CuSO4 after dilution? 8. A gas occupies a volume of 2.5 L at a pressure of 1.0 atm. What volume will it occupy, at the same temperature, at a pressure of 0.25 atm? 9. A 400 cm3 steel cylinder holds 1.50 g of ethanol, C2HsOH, vapor at 250 °C. What is the pressure of the ethanol vapor? (R 0.08206 L.atm/K.mol) 10. A gas is collected at 24°C and 1.20 atm pressure in a bulb of volume 0.763 L. What is the volume of the gas at STP? 11. A 118-mL flask is evacuated and found to have a mass of 97.129 g. When the flask is filled with 768 torr of an impure helium gas at 35 °C, it is found to have a mass of 97.171 g. What is the mass(g) of the impurity? 12. The density of a gas which behaves ideally is 2.25 g/L at a pressure of 2.0 atm and a temperature of 25°C. What is its molar mass?
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Mi: 2-1-S 0.15 M = 2 50 9) - nR1 o.니 ㄴ 5 R. T mels て

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