Question

A chemical equation is shown:

C2H4 + O2 → CO2 + H2O

According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?

5
6
7
8

Answer 1

C2H4 + O2 → CO2 + H2O

eqn is unbalanced - balancing by counting no. of C n H atoms

C=2 n H=4 in one C2H4

so the reaction will form two CO2 + two H2O

counting no. of O atoms: 2*2 + 2*1

=4+2

=6

Answer 2

6 atoms of oxygen will exist in the products of this reaction.

LAW OF CONSERVATION OF MASS:

• The law of conservation of mass states that mass can neither be created nor destroyed.

• This means that in a chemical reaction, the number of atoms of each element on both sides of the equation must be the same.

• According to this question, the following chemical equation in accordance to the law of conservation of mass is balanced as follows:

• C2H4 + 3O2 → 2CO2 + 2H2O

• Based on the above equation, 6 atoms of oxygen is present on the product side of the reaction.

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