Question

A sample of CO2 gas at 100.°C has a volume of 250. mL at 760. mm Hg. How many moles of CO2 are present? The value of the ideal gas constant, R, is 0.0821 L.atm/K.mole. O 0.00816 mol O 0.0304 mol O 6.20 mol O 8.16 mol

Answer 1

To calculate the number of moles of CO2 present, we can use the ideal gas law formula:

PV = nRT

where:

P = pressure (in atm)

V = volume (in liters)

n = number of moles

R = ideal gas constant (0.0821 L.atm/K.mol)

T = temperature (in Kelvin)

First, we need to convert the given temperature from Celsius to Kelvin:

100°C + 273.15 = 373.15 K

Now, we can plug the values into the ideal gas law:

(760 mmHg / 760) = (n * 0.0821 * 373.15) / 0.250 L

n = (760 * 0.250) / (0.0821 * 373.15)

n ≈ 8.16 moles

So, there are approximately 8.16 moles of CO2 present. The correct option is "8.16 mol O".