Question

Please show all equations used and work

Make sure to write the answer with the correct significant figures and units.

BOX YOUR FINAL ANSWER.

1a) How many inches of mercury are in 734 mm Hg?

1b) A 0.48-mole sample of helium gas occupies a volume of 11.7 L. What is the volume of 0.72 mol of helium gas under the same conditions?

1c) A chemical reaction occurring in a cylinder equipped with a moveable piston produces 0.81 mol of a gaseous product. If the cylinder contained 0.25 mol of gas before the reaction and had an initial volume of 3.0 L, what was its volume after the reaction?

Answer 1

1a)

734 mmHg/25.4 = 28.504 inch Hg

1b) Volume of 0.72 mol He gas

= 11.7 L x 0.72 mol/0.48 ml

= 17.55 L

1c) Final volume after the reaction = 3.0 L x 0.81 mol/0.25 mol

                                                       = 9.72 L