Methane in natural gas burns completely in oxygen

[chawki]

Homework Statement

The methane in natural gas burns completely in oxygen according to the reaction equation:
CH₄ +__O₂ → __CO₂ + __H₂O

Homework Equations

a) Complete the reaction equation by filling in the missing coefficients for oxygen, carbon
dioxide and water.
b) How many kilograms of water do you get when you burn 1 kg of methane completely?
Atomic masses: C: 12, H: 1, O: 16.
c) Write the reaction equation for burning ethanol (C₂H₅OH) in oxygen completely.

The Attempt at a Solution

a) CH₄ + 2 O₂ → 1 CO₂ + 2 H₂O

b) CH₄ + 2 O₂ → 1 CO₂ + 2 H₂O

1000g-----------------------m_water
16g -------------------------2*18g
m_water= (1000*2*18)/16
m_water= 2250g =2.25Kg

c)

 

[Borek]

So far, so good. Technically - if your teacher is strict about significant digits - you should report 2 kg.

 

[chawki]

Ok, thank you!
what about c)

C₂H₅-OH + 3O₂ -----> 2CO₂ + 3H₂O ?

 

[Borek]

Count atoms on both sides and you will know if the reaction is balanced, or not.

 

[chawki]

I think it's balanced, we have 2C, 6H, and 7O on each side.