A cylinder with a movable piston contains 2.00 g of helium gas. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 2.70 L?
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A cylinder with a movable piston contains 2.00g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted ... 2g He = 2L. (2.9L / 2L) x 2g = 2.9g - 2g = 0.9g added.
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