A flask containing 12 g of a gas of relative molecular mass 20 at a pressure of 100 atm was evacuated using 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 (No = 6 × 1023 mol−1 )?

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A flask containing 12 g of a gas of relative molecular mass 20 at a pressure of 100 atm was evacuated using 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 (No = 6 × 1023 mol−1 )?