<u>Answer:</u> The pressure of CO gas is 4.08 atm
<u>Explanation:</u>
To calculate the number of moles, we use the equation:

Given mass of CO = 14 g
Molar mass of CO = 28 g/mol
Putting values in above equation, we get:

To calculate the pressure of the gas, we use the equation given by ideal gas which follows:

where,
P = pressure of the gas = ?
V = Volume of the gas = 3.5 L
T = Temperature of the gas = ![75^oC=[75+273]K=348K](https://tex.z-dn.net/?f=75%5EoC%3D%5B75%2B273%5DK%3D348K)
R = Gas constant = 
n = number of moles of CO gas = 0.5 moles
Putting values in above equation, we get:

Hence, the pressure of CO gas is 4.08 atm