If 0.25 mol of methane gas (CH4) is introduced into evacuated 2.00 L container at 35 Degrees Celcius , what is the pressure in the container ?

See your post above.

To find the pressure inside the container, we can use the ideal gas law equation, which is:

PV = nRT

Where:
P = pressure of the gas (in units of pressure, such as atm)
V = volume of the container (in liters)
n = number of moles of gas
R = ideal gas constant (0.0821 L.atm/(mol.K))
T = temperature of the gas (in Kelvin)

First, let's convert the temperature from Celsius to Kelvin:
T(K) = T(°C) + 273.15
T(K) = 35°C + 273.15 = 308.15 K

Now, we can plug in the values we have:
P * 2.00 L = 0.25 mol * 0.0821 L.atm/(mol.K) * 308.15 K

Let's solve for P:
P = (0.25 mol * 0.0821 L.atm/(mol.K) * 308.15 K) / 2.00 L

P ≈ 10.17 atm (rounded to two decimal places)

Therefore, the pressure inside the container is approximately 10.17 atm.