# chemistry

posted by .

a 5 g mixture of natural gas containing ch4 and c2h4 was burnt in excess of oxygen yielding 14.5 g of co2 and h2o.What is the weight of ch4 and co2 in the mixture

• chemistry -

CH4 + 2O2 ==> CO2 + 2H2O
C2H4 + 3O2 ==> 2CO2 + 2H2O

Let x = mass CH4
and y = mass C2H4
------------------
You need two equations.
(eqn 1) is total mass = 5g
(eqn 2) is (mass CO2+H2O from CH4) + (mass CO2+H2O from C2H4) = 14.5g
------------------------
Now convert those into x and y and solve. I have let mm stand for molar mass below.
(eqn 1) is x + y = 5
(eqn 2) is
[x(mmCO2/mmCH4)+x(2*mmH2O/mmCH4)]+y(2*mmCO2/mmC2H4)+y(2mmH2O)/mmC2H4] = 14.5g
Solve for x = mass CH4
y = mass C2H4.
Post your work if you get stuck.

## Similar Questions

1. ### Chemistry

A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture?
2. ### Chemistry

A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture?
3. ### Chemistry

A mixture of methane (CH4) and ethane (C2H6) of mass 13.43g is completely burned in oxygen. If the total mass of CO2 and H2O produced is 64.84 g, calculate the fraction of CH4 in the mixture. CH4 + C2H6 arrow CO2 + H2O 13.43g 64.84g …
4. ### Chemistry

a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio …
5. ### Chemistry

a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio …
6. ### chemistry

Burning 32 g of CH4 in excess oxygen will produce how much CO2 according to the equation CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
7. ### Chemistry

A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture?
8. ### help

Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction?
9. ### chemistry

The combustion of 1.210 g of a mixture of CH4 and C2H6 gives 3.372 g of CO2 I have to determine the composition of the mixture (mastic %) and molar fraction of CH4 in the mixture CH4 + C2H6: CO2 + 2H2O C2H6 + O2: CO2 + H2O CH4 + C2H6 …
10. ### Physical Science

Hi! Thanks for checking my question out! ____ 1. Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction?

More Similar Questions