Question

In the reaction 2H2 +O2 =_____H2O what coefficient should be placed in front of H2O To balance the reaction

Answer 1

2.
You need to look at how many atoms of each element you have on the one side and make it equal to the other.
You have 4 hydrogen atoms on the left side. On the right you have 2. To get from 2 to 4 you must multiply by 2.
To check this you can see you have 2 oxygen atoms on the left and 1 on the right. This again needs to be multiplied by 2.

Answer 2

The coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.

BALANCED REACTION:

• An equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

• To balance chemical equations, a coefficient is used. A coefficient is a number placed in front of an element to complete the number of atoms.

• In the following reaction:
• 2H2 +O2 = H2O.

• To balance the number of atoms of hydrogen and oxygen elements, we use coefficient 2.

• Therefore, coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.

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