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6 Nov 2019
Nitrogen gas and 4.00g of helium gas occupy the same volume at any temperature and pressure. A 118-mL flask is evacuated, and its mass is measured as 97.129g. When the flask is filled with 768 torr of helium gas at 35 degree C, it is found to have a mass of 97.171g. IS the gas pure helium? A gaseous compound containing hydrogen and carbon is decomposed and found to contain 58.63% C and 14.37% H by mass. The mass of 258 ml of the gas, measured at STP, is 0.646g. What is the molecular formula of the compound? Show transcribed image text
Nitrogen gas and 4.00g of helium gas occupy the same volume at any temperature and pressure. A 118-mL flask is evacuated, and its mass is measured as 97.129g. When the flask is filled with 768 torr of helium gas at 35 degree C, it is found to have a mass of 97.171g. IS the gas pure helium? A gaseous compound containing hydrogen and carbon is decomposed and found to contain 58.63% C and 14.37% H by mass. The mass of 258 ml of the gas, measured at STP, is 0.646g. What is the molecular formula of the compound?
Show transcribed image text