Question

Which set of coefficients will balance this chemical equation?

__C2H4(g) + __O2(g) → 2CO2(g) + 2H2O(g)
2, 3
1, 3
1, 2
2, 5

Answer 1

B 1,3

Step-by-step explanation:

Count the atoms on each side of the arrow, they have to be equal

After arrow

2x C

6x O

4x H

Before the arrow

2x C - correct, as it is the only compound with C then there must only be 1 mole of it.

This is also the correct amount of H

We need 6x O total so 6/2 = 3

So there are 3 moles of O