Question

H2 + o2 2H2O here why is there not a coefficient for O2

Answer 1

Answer:

Explanation:

Left side: H = 2 ; O = 2 (number based on the subscript)

Right side: H = 2 ; O = 1 (number based on the subscripts; no subscript means that the element is just 1)

Notice that the number of H is already balance but the number of O is not. In order to balance the O, you need to multiply the element by 2, but you CANNOT do this by simply changing the subscript.

Hence,  

H

2

+

O

2

=

2

H

2

O

Left side: H = 2 ; O = 2

Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2

Answer 2

Answer:

Because water is composed of two hydrogen atoms and only one oxygen atom.

And remember, if no coefficient is present, assume a one to be present.

O₂ or (1)O₂

Explanation:

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