Question

conservation quick check
if the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be _. (1 point)
28 grams
30 grams
0 grams
32 grams

Explanation:

Step1: Recall mass - conservation law

In a chemical reaction, mass is conserved. That is, the total mass of reactants equals the total mass of products.

Answer:

30 grams