The pressure is the factor that is determined by the ideal gas equation. The pressure of the 4 mol helium gas at 29 degrees Celsius is 0.6611 atm.
The ideal gas equation establishes the relation between the various factors like the moles, temperature, pressure, volume, and gas constant. They were used to derive the various laws and relationships.
The pressure is directly affected by the temperature and inversely by the volume of the gas.
Given,
Moles of helium gas (n) = 4.0 mol
Volume (V) = 15.0 L
Temperature (T) = 29 degrees Celsius = 302 kelvin
Gas constant (R) = 0.00821 L atm mol⁻¹ K⁻¹
The ideal gas equation is given as,
PV = nRT
Substituting the values above as
P = nRT ÷ V
P = (4.0 × 0.00821 × 302) ÷ 15.0
= 0.6611 atm
Therefore, 0.6611 atm is the pressure of 4.0 mol of helium gas.
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