In the balanced chemical equation for the formation of water, if there are 2 water molecules on the product side, how many oxygen molecules 0( 0 ext{O}_2 0) 0 are required on the reactant side?
Answer and explanation
Correct answer: One
The balanced equation for forming water is
0(
02 ext{H}_2+ ext{O}_2
ightarrow2 ext{H}_2 ext{O}
0)
0. The 2 water molecules on the product side contain 2 oxygen atoms altogether. One
0(
0 ext{O}_2
0)
0 molecule also contains 2 oxygen atoms, so 1 oxygen molecule is required on the reactant side. Using two oxygen molecules would not balance the oxygen atoms.
Frequently asked questions
What is the correct answer to this question?
One
Why is this the correct answer?
The balanced equation for forming water is
0(
02 ext{H}_2+ ext{O}_2
ightarrow2 ext{H}_2 ext{O}
0)
0. The 2 water molecules on the product side contain 2 oxygen atoms altogether. One
0(
0 ext{O}_2
0)
0 molecule also contains 2 oxygen atoms, so 1 oxygen molecule is required on the reactant side. Using two oxygen molecules would not balance the oxygen atoms.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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