In order to find the missing pressure of this gas, we need to use the Ideal Gas Law formula, which is a gas law that perfectly correlates each provided information, the formula is:
PV = nRT
Where:
P = pressure
V = volume, 2.0 Liter
n = number of moles, we will find it as well
R = gas constant value, 0.082
T = temperature in kelvin, 30°C = 303 K
To find the number of moles, we need to use the given mass, 10 grams, and the molar mass of CH2O, 30g/mol
30g = 1 mol
10g = x moles
x = 0.33 moles of CH2O in 10 grams
Now we can use the Ideal gas law formula:
P * 2 = 0.33 * 0.082 * 303
2P = 8.19918
P = 4.1 atm is the pressure
