Which equation below correctly reflects the law of conservation of matter?

Question

A. H2SO4 + 2NaOH--->Na2SO4 + H2O

B. S + O2 --->SO2

C. Fe + H2O ---> Fe3O4 + H2

D. 2H2O + H2 + O2

E. Al + 3O2 ---> 2 Al2O3

Answer 1

I may be wrong here but   A.  should be right.

Answer 2

C. Fe + H2O ---> Fe3O4 + H2

Answer 3

Law of conservation of matter states that element can neither be created or destroyed during occurrence of a process.

A is wrong because the count for H and O elements is not equal for both sides.

B is correct because the numbers of S and O elements is equal on the left and right side.

C is wrong because there are more count for Fe element on the right side compared to the left side. Elements cannot be created or destroyed.

D is wrong because is does not reflect the Law of conservation of matter. It does not show any changes to the elements.

E is wrong because of the Al element count. The number 2 on the right side of the equation that is in front of the Al2O3 elements indicates that there is 2 count of Al2O3 element. Therefore, there is 4 count of Al element while there is 6 count of O element on the right side of the equation.

Answer 4

D..Because both sides of the equation contain same moles of hydrogen and oxygen.