Question

How would the number of moles (n) of O2 change if the atmospheric pressure doubled but all variables stayed the same?

Answer 1

The no. of moles will be doubled as the pressure is doubled.

Step-by-step explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

• If V and T are constant, and have different values of P and n:

(P₁n₂) = (P₂n₁).

P₂ = 2P₁,

∴ n₂ = (P₂n₁)/(P₁) = (2P₁n₁)/(P₁) = 2n₁.

So, the no. of moles will be doubled as the pressure is doubled.