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Calculate the volume of the reactant left over and the volume of carbon dioxide...

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thisisalongword | Student, Grade 11 | Salutatorian

Posted February 2, 2012 at 4:15 PM via web

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Calculate the volume of the reactant left over and the volume of carbon dioxide produced.

 

100 mL of methane and 100 mL of oxygen were mixed together and the mixture was sparked. The equation for the combustion reaction is:

CH4 (g) + 2O2 (g) --> CO2 (g) +2H2O (g)

All gases are measured at the same temperature and pressure. Under these conditions, water is in the gas state.

Calculate the volume of the reactant left over and the volume of carbon dioxide produced.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted February 3, 2012 at 1:02 AM (Answer #1)

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100 mL of methane and 100 mL of oxygen are mixed together and ignited. The reaction between the gases is given by :

CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (g)

It can be seen that 1 mole of methane reacts with 2 moles of oxygen to given 2 moles of water and one mole of carbon dioxide.

If two different gases are at the same pressure, temperature and occupy the same volume the number of moles of the gases is the same.

In the reaction 100 mL of methane and 100 mL of oxygen are the reactants. As 2 moles of oxygen are required for 1 mole of methane, 50 mL of methane is left unreacted. The volume of carbon dioxide produced is 50 mL.

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