3. a sample of octane (c3h18) gas has a mass of 1.135 g at a volume of 400. cm'3 and a temperature
of 200.°с. what is the pressure of the gas?

9.65 atm

From the question, we are given;

       But, K = °C + 273.15

We are required to calculate the pressure of the gas.

To do this, we are going to use the ideal gas equation;

P = nRT ÷ V

                                    = 0.00994 moles

Therefore;

P = 9.65 atm

Thus, the pressure of the gas is 9.65 atm

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