Mass box a = 10 grams; mass box b = 5 grams; mass box c—made of one a and one b how many grams of a would be needed to give the same number of particles: as 7.5 grams of b? as 2.5 grams? as 12.5 grams? as 1 gram?

The correct answers are 15g A, 5g A, 25g A and 2g A.

Explanation:

First we must take into account the masses of A () and B (

) :

= 10g

= 5g

 Now, in the case of 7.5 g of B:

= (7.5g B / 5g B) * 10g A = 15gA

For the case of 2.5 g of B:

= (2.5g B / 5g B) * 10g A = 5gA

For the case of 12.5 g of B:

= (12.5g B / 5g B) * 10g A = 25gA

For the case of 1 g of B:

= (1g B / 5g B) * 10g A = 2gA

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