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A) A 2.0 L balloon contains 0.50 mol of helium. Determine the mass of gas to be added or removed to increase the volume of

A) A 2.0 L balloon contains 0.50 mol of helium. Determine the mass of gas to be added or removed to increase the volume of the balloon to 3.0 L, with no change in pressure or temperature
B) How would it be possible to obtain the same result as in the previous question by modifying only the temperature of the gas if the helium was initially at 20C

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