Question

What are the coefficients when the equation below is balanced?___H2 + ___ O2 to ___ H2O4,3,11,1,22,2,12,1,2

Answer 1

2,1,2

Step-by-step explanation:

I took the test

Answer 2

2, 1, 2

option D

EXPLANATION

Given that;

`\text{ ---H}_2\text{ + ---- O}_2\text{ }\rightarrow\text{ --- H}_2O`

Apply the law of conservation of mass to balance the given chemical equation

Law of conservation of mass states that matter can neither be destroyed nor created but can be transformed from one form to another

Assign letters to each of the reactant and product

We have,

`\text{ aH}_2\text{ + bO}_2\text{ }\rightarrow\text{ cH}_2O`

2a = 2c

2b = c

since c = 2b

Hence,

2a = 2(2b)

2a = 4b

Recall, 2a = 2c

2c = 4b

c = 4b/2

c = 2b

Hence, a = 2, b = 1 and c = 2

`\text{ 2H}_2\text{ + O}_2\text{ }\rightarrow\text{ 2H}_2O`

Therefore, the correct answer is 2, 1, 2 ------ option D

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