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A flask contains 12 g of a gas of relative molecular mass 120 at a pressure of 100 atm. It was evacuated by meansof a pump until the pressure was 0.01 atm. Which of the following is the best estimate of the number of molecules left in the flask? (N = 6 × 1023 mole'1)

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A flask contains 12 g of a gas of relative molecular mass 120 at a pressure of 100 atm. It was evacuated by meansof a pump until the pressure was 0.01 atm. Which of the following is the best estimate of the number of molecules left in the flask? (N = 6 × 1023 mole'1)






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