Question

_C2H2(g) + __O2(g) → __ CO2(g) + __ H2O(g)
When the equation above is balanced, what is the coefficient for oxygen?

A. 2
B. 3
C. 4
D. 5

Answer 1

Answer:

2 $C_2H_2$(g) + 5 $O_2$(g) → 4 $CO_2$(g) + 2 $H_2O$(g)

Explanation:

The question asks us to balance the equation:

__ $C_2H_2$(g) + __ $O_2$(g) → __ $CO_2$(g) + __ $H_2O$(g)

Now, while balancing, don't take the (s), (aq) and (g) into consideration. They just show what types of elements are they.

Now, lets list down the elements in the left side and in the right side.

LHS:                                RHS:

C - 2                                C - 1

H - 2                                H - 2

O - 2                                O - 3

Now, we need to balance these two sides, and for that, refer to the image.

Now, the answer will appear as:

2 $C_2H_2$(g) + 5 $O_2$(g) → 4 $CO_2$(g) + 2 $H_2O$(g)

And, the coefficient of $O_2$ is 5.

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Hope it helps

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Answer 2

Answer :

_2 _C2H2(g) + _5_O2(g) → _4_ CO2(g) + _2_ H2O(g)