If the mass of elements before a chemical reaction is 30 grams , after the chemical reaction , the mass will be _
A.) 28g
B.) 30 g
C.) 32g
D.) 0 g
If the element is 30 g before the reaction it will be 30 grams after a reaction. The TOTAL mass may change if the element has combined with another element but the initial element still will be 30 g.
To answer this question, we need to understand the concept of conservation of mass in a chemical reaction. According to the law of conservation of mass, the mass of the reactants before a chemical reaction must be equal to the mass of the products after the reaction.
In this case, if the mass of the elements before the chemical reaction is 30 grams, then the mass of the products after the reaction should also be 30 grams.
Therefore, the correct answer is B) 30 g.