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Formaldehyde's molecular formula is CH2O, and according to the atomic masses of its constituent elements, the gas has a molar mass of 30g/mol. If you have 12.3g of it, then set up a direct proportion where 30/1=12.3/x. Solve for x to get 0.41 moles. Multiply this by the constant of 22.4 liters/mole of any gas at STP, and you get 22.4x0.41=9.184 liters CH2O at STP.

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Q: What is the volume of 12.3 grams of formaldehyde gas at STP?
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