Chris E. When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is CH4(g)+O2(g)→CO2(g)+H2O(g)This type of reaction is referred to as a complete combustion reaction
1 Expert Answer
Nathan I. answered • 04/23/19
Patient, Knowledgeable Tutor in Chemistry
First, we need to balance the stoichiometry equation.
?CH4(g) + ?O2(g) --> ?CO2(g) + ?H2O(g)
Lets start by putting 1 for each question mark. There are 2 hydrogens in water, and 4 in methane. This means whatever number we put in front of methane, the number in front of H2O has to be double that. If we put a 2 in front of H2O, the only thing unbalanced in the equation in the number of oxygens: there are four on the right side and only two in the oxygen on the left. We can make the coefficient in front of oxygen 2:
1CH4(g) + 2O2(g) --> 1CO2(g) + 2H2O(g)
But, to use the stoichiometry equation, we need to figure out the number of moles of methane used, instead of grams. The molecular weight of methane is 16.043g/mol. We can use this to find the moles of methane:
1.2*10^-3g / (16.043g/mol)=7.48*10^-5 moles of methane
Now that we know the number of moles of methane combusted, we can use the stoichiometry equation to find out how many moles of CO2 this equates to. For every mole of methane burned, a mole of CO2 is produced:
7.48*10^-5 mol CH4 * (1 mol CO2 / 1 mol CH4) = 7.48*10^-5 mol CO2
We know that the reaction goes to completion, so all the methane will be reacted. To find the mass of carbon dioxide used, we can use the number of moles from the above equation, and the molecular weight of CO2 (= 44.009 g/mol).
7.48*10^-5 mol CO2 * 44.009 g/mol = 3.29*10^-3 g CO2
The mass of CO2 produced is 3.29*10^-3g.
2016-09-15T18:02:59-04:00
What mass of oxygen is needed for the complete combustion of 4.00×10−3 g of methane?
1
2016-09-16T08:59:04-0400
The combustion reaction of methane:CH4 + 2O2 → CO2 + 2H2O1 mol 2 mol 1 mol 2 molThe number of moles CH4:n(CH4) = m(CH4) / M(CH4) = 4.00×10−3 / 16 g/mol = 0.00025 molThe number of moles O2:n(O2) = n(CH4) × 2 = 0.00025 mol × 2 = 0.0005 molm (O2) = n(O2) × M (O2) = 0.0005 mol × 32 g/mol = 0.016 gAnswer: 0.016 g
2015-09-14T12:10:12-04:00
When methane (CH4) burns, it reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is CH4(g)+O2(g)→CO2(g)+H2O(g) This type of reaction is referred to as a complete combustion reaction. What mass of carbon dioxide is produced from the complete combustion of 9.00×10−3 g of methane? Express your answer with the appropriate units. What mass of water is produced from the complete combustion of 9.00×10−3 g of methane? Express your answer with the appropriate units. What mass of oxygen is needed for the complete combustion of 9.00×10−3 g of methane?
Express your answer with the appropriate units.
1
2015-09-16T03:18:55-0400
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Do you mean...,
8.60 X 10^(-3)
or
8.60 X 10^3
?
If I do not hear back from you by tomorrow I'll do this simple combustion problem both ways, but you could save me the work by using the proper notation. This...^...means to raise to a power.
======
First the balanced equation,
CH4 + 2O2 --> CO2 + 2H2O
------First, 8.60 X 10^(-3) g
8.60 X 10^(-3) g (1 mole CH4/16.042 g)(2 mole O2/1 mole CH4)(32 g/1 mole O2)
= 0.034 grams oxygen
======Now, 8.60 X 10^3 g
8.60 X 10^3 g (1 mole CH4/16.042 g)(2 mole O2/1 mole CH4)(32 g/1 mole O2)
= 3.43 X 10^4 grams oxygen
======Both ways.
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