Question

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?

Answer 1

As 1 gram................

Answer 2

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

Step-by-step explanation:

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

`m_(B)`) :

`m_(A)` = 10g

`m_(B)` = 5g

Now, in the case of 7.5 g of B:

`m_(A1)` = (7.5g B / 5g B) * 10g A = 15gA

For the case of 2.5 g of B:

`m_(A2)` = (2.5g B / 5g B) * 10g A = 5gA

For the case of 12.5 g of B:

`m_(A3)` = (12.5g B / 5g B) * 10g A = 25gA

For the case of 1 g of B:

`m_(A4)` = (1g B / 5g B) * 10g A = 2gA

Have a nice day!