hi, pls help me how to solve this one using avogadro's law

Question

1. A 25.5 liter balloon holding 3.5 moles of helium

leaks. If we are able to determine that 2 moles of

helium escaped before the balloon was sealed,

what would be the new volume of the balloon?

2. If a 32.8 liter container holds 2.98 moles of

hydrogen at 35.1 °C and 2.3 atm. How many

moles of hydrogen are in 50 liter container under

the same conditions?

Answer 1

If you began with 3.5 moles of helium and 2 moles escaped, that would leave you with 1.5 moles of helium gas in the balloon.

V1 = 25.5 liters

n1 = 3.5 moles

V2 = ?

n2 = 1.5 moles

Avogadro's law: V1 / n1 = V2 / n2

(25.5 L) / (3.5 mols) = (V2) / (1.5 mols)

V2 = 10.9 L

V1/n1 = V2/n2 because both temperature and pressure are constant.

(32.8 L) / 2.98 mols = 50 L / n mols

n = 4.5 moles