Question

The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath.

AB + CD → AC + BD
(15 g) (?) (?) (10 g)

The total mass of the products is 50g. Which best completes the other two amounts?

The amount of CD is 40 g, and the amount of AC is 35 g.
The amount of CD is 35 g, and the amount of AC is 40 g.
The amount of CD and AC would be the same.
The amount of CD and AC is undetermined.

Answer 1

B is the answer on edge

Step-by-step explanation:

B: The amount of CD is 35 g, and the amount of AC is 40 g.

Answer 2

Step-by-step explanation:

The amount of CD is 35 g, and the amount of AC is 40 g.

Step-by-step explanation:

AB + CD \rightarrow AC + BDAB+CD→AC+BD

The law of conservation of mass states that in any chemical reaction, the total mass of the reactants must be equal to the total mass of the products.

In this reaction, we know the mass of one reactant (AB, 15 g) and the mass of one product (BD, 10 g). In order to have the same total mass on the left side and on the right side of the equation, the mass of AC must be 5 g more than the mass of CD. We see that the only choice that satisfies this condition is:

The amount of CD is 35 g, and the amount of AC is 40 g.

In fact, if we assume these masses are correct, we have:

- on the reactant side: m(AB)+m(CD)= 15g + 35g = 50g

- on the product side: m(AC)+m(BD)= 40g + 10g = 50g

so, we have the same mass on both sides of the equation, and the law of conservation of mass is satisfied.