Under certain circumstances, carbon dioxide,CO2(g) , can be made to react with h

Question

Under certain circumstances, carbon dioxide,CO2(g) , can be made to react with hydrogen gas,H2(g), to produce methane,CH4(g) , and water vapor, H2O(g) = CO2(g)+ 4H2(g) ------ CH4(g)+ 2H2O(g) Part A How many moles of methane are produced when 71.1 of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units. Part B How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 65.1 of water vapor? Express your answer with the appropriate units.

Explanation / Answer

For the first question, you would just use the molar ratio. Take the given amount of moles and multiply it by the methane to carbon dioxide molar ratio given in the reaction. For the second part you'd do the same thing. Take the amount given and multiply it by the ration of hydrogen gas to the water vapor. If you use dimensional analysis then the units will cancel and that will let you know if you multiplied or divided by the right or wrong units. 1) 48.1 mol CO2 * (1 mol CH4 / 1 mol CO2) = 48.1 mol CH4 2) 88.1 mol H2O * (4 mol H2 / 2 mol H2O) = 176.2 mol H2

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