A mixture of 2 g of H2 gas (MM= 2g/mol) and 16 g of Ne gas (MM= 4g/mol) were occupied in 2 L balloon at 30'C. What is the total pressure
inside the balloon?

The total pressure  inside the balloon : 62.1 atm

Given

2 g of H2 gas (MM= 2g/mol)

16 g of Ne gas (MM= 4g/mol)

2 L balloon  at 30'C

Required

The total pressure

Solution

mol H2 :

= mass : MM

= 2 : 2

= 1

mol Ne :

= 16 : 4

= 4

Total mol of gas = 5

T = 30+273 = 303 K

Ideal gas law :

P = nRT/V

P = 5 moles x 0.082 L.atm/mol.K x 303 K / 2 L

P = 62.1 atm

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.