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The density of an elemental gas is 1.7824 g/L at STP. What is the molar mass of the element?

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1 mole of the gas will occupy 22.4 L at STP. So mass = volume x density. You have density and volume, solve for mass of 1 mole (which of course is molar mass).
What is the new volume, in milliliters, of the balloon if remains constant and the balloon is very elastic?
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