A gas has a percent composition by mass of 757 carbon and
A gas has a percent composition by mass of 75.7% carbon and 14.3% hydrogen. At STP the density of the gas is 2.50 g/L. What is the molecular formula of the gas?
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a gas has a percent composition by mass of 757 carbon and 143 hydrogen at stp the density of the gas is 250 gl what is
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