Question

conservation quick check
78 g of potassium (k) react with 71 g of chlorine (cl) to produce potassium chloride. according to the law of conservation of mass, what is the mass of the product (2kcl)? (1 point)
2 g
4 g
156 g
149 g

Explanation:

Step1: Recall mass - conservation law

The Law of Conservation of Mass states that the total mass of reactants equals the total mass of products in a chemical reaction.

Step2: Calculate total mass of reactants

The mass of potassium is 78 g and the mass of chlorine is 71 g. The total mass of reactants is \(78 + 71\) g.
\[78+71 = 149\text{ g}\]
Since the mass of products is equal to the mass of reactants according to the Law of Conservation of Mass, the mass of the product (2KCl) is 149 g.

Answer:

149 g