Question

Chlorine pentafluoride gas is collected at -14.0 degrees Celcius in an evacuated flask with a measured volume of 30.0L When all the gas has been collected, the pressure in the flask is measured to be 0.260atm.

Calculate the mass and number of moles of chlorine pentafluoride gas that were collected. Round your answer to 3 significant digits.

Answer 1

Use PV = nRT.
You have a P, a V, you know R, and you have T (remember to convert to K). Solve for n = number of moles, then mass = moles x molar mass.