Which chemical equation follows the law of conservation of mass? A. 2NaOH + H2S04 - Na2SO4 + H20
B. NaOH+H2SO4 - Na2SO4 + 2H20
C. 2NaOH + H2S04 - Na2SO4 + 2H20
D. NaOH + H2SO4 - Na2SO4+H20

C. 2NaOH + H₂SO₄ -> Na₂SO₄ + 2H₂O

Explanation:

Simply count up the elements in the reactants and the products, then compare.

Reactants:

2 Na = 2 Na

2 O + 4 O = 6 O

2 H + 2 H = 4 H

Products:

2 Na = 2 Na

4 O + 2 O = 6 O

2 x H₂ = 4 H

Because the constituent elements in the reactants = products, the law of conservation of mass is preserved. You can check the other 3 options to see that they will not equal each other.

Don't forget to distribute the coefficients to every part of the formula; on the other hand, subscripts only apply to the element they are under. If a coefficient needs to be multiplied to an element with a subscript, use the subscript instead of 1 (1 is when there are no subscripts).

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