Question

If 5 g of element A combines with 16 g of element B to form compound AB, how many grams of B
are needed to form compound AB2?

Answer 1

Basrd on the mass ratio of the elements given, 10 g of B is needed to form compound AB2.

How many grams of B are needed to form compound AB2?

The equation of the reaction of a fixed mass of A with B to form AB id given below:

• A + B ----> AB

From the data provided, 5 g of A reacts with 5 g of B to form AB.

Then, to form the compound AB2:

mass ratio of A and B is 1:2

5 g of A is needed

2 ×:5g of B is needed = 10 g of B.

Therefore, 10 g of B is needed to form compound AB2.

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