Since there is no information about Temperature and Pressure, it is assumed that

Question

Since there is no information about Temperature and Pressure, it is assumed that O2 and He are at STP.

At STP, P = 1 atm , T = 273 K

8) a) It is assumed that O2 gas is at STP

At STP,

P = 1 atm

T = 273 K

Given that Volume of O2 gas V = 56.4 L

number of moles of O2 gas , n = ?

Ideal gas equation is

PV = nRT R = universal gas constant = 0.0821 L.atm/K/mol

n = PV/RT

= 1 atm x 56.4 L / ( 0.0821 L.atm/K/mol x 273 K)

= 2.52 moles

Therefore,

number of moles of O2 in 56.4 L of O2 gas = 2.52 moles

b)

It is assumed that He gas is at STP.

At STP,

P = 1 atm

T = 273 K

Given that number of moles of He gas, n = 0.17 moles

volume of He gas, V = ?

Ideal gas equation is

PV = nRT R = universal gas constant = 0.0821 L.atm/K/mol

V = nRT/P

= 0.17 moles x 0.0821 L.atm/K/mol x 273 K / 1 atm

= 3.81 L

Therefore,

volume occupied by 0.170 mole of He gas = 3.81 L

Explanation / Answer

8]] a) the number of moles of O2 in 56.4 L of O2 gas

b) the volume, in liters, occupied by 0.170 mole of He gas

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