Question

In a reaction, 25 g of reactant AB breaks down into 10g of Product A and an unknown amount of Product B. What is the mass of product B?

Answer 1

Mass of product B = 15g

Step-by-step explanation:

Reaction:

AB → A + B

Mass of AB = 25g

Mass of A = 10g

Unknown:

Mass of B = ?

Solution:

Based on the law of conservation of matter "matter is neither created nor destroyed but transformed from one form to another in a chemical reaction".

The amount of product = amount of reactant

Mass of AB = Mass of A + Mass of B

Now;

Mass of Product B = Mass of AB - Mass of A

Mass of product B = 25 - 10 = 15g

Mass of product B = 15g