Answer:
The coefficient are 1,2,1,2 ( option B is correct)
Explanation:
Step 1: Data given
Methane = CH4
Burning methane = CH4 + O2
Step 2: The unbalanced equation
CH4(g) + O2(g) → CO2(g) + H2O(g)
Step 3: Balancing the equation
CH4(g) + O2(g) → CO2(g) + H2O(g)
On the left side we have 4x H (in CH4), on the right side we have 2x H (in H2O). To balance the amount of H, on both sides, we have to multiply H2O (on the right side by 2).
CH4(g) + O2(g) → CO2(g) + 2H2O(g)
On the left side we have 2x O (in O2), on the right side we have 4x O (2x in CO2 and 2x in 2H2O). To balance the amount of O on both sides, we have to multiply O2 (on the left side by 2).
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
The coefficient are 1,2,1,2 ( option B is correct)
