# Density And Gas Laws

Suppose that 5.4 L of methane at a pressure of 646 Torr is transferred to a vessel of volume 3.2 L. What is the final pressure of methane if the change occurs at constant temperature? Answer in units of Torr.

A fluorinated organic gas in a cylinder is compressed from an initial volume of 910 mL at 150 Pa to 492 mL at the same temperature. What is the final pressure? Answer in units of Pa.

A mixture of three gases, A, B, and C, is at a total pressure of 7.04 atm. The partial pressure of gas A is 1.53 atm; that of gas B  3.8 atm. What is the partial pressure of gas ? Answer in Unit of atm

Solid iron(III) hydroxide decomposes to produce iron(III) oxide and water vapor. 0.930 L of water vapor is produced at STP. How much iron(III) hydroxide was used? Answer in units of g.

How much iron(III) oxide is produced? Answer in units of g. 010 10.0 points A helium balloon has a volume of 16.7 L when the pressure is 1.753 atm and the temperature is 20 â—¦C. The balloon is cooled at a constant pressure until the temperature is −16â—¦C. What is the volume of the balloon at this stage? Answer in units of L.

What volume of lead (of density 11.3 g/cm3 ) has the same mass as 382 cm3 of a piece of redwood (of density 0.38 g/cm3 )? Answer in units of cm3 .

A 173 mL flask contains argon at 1.1 atm and 81 â—¦C. What amount of Ar is present? Answer in units of mol.

A 132 mL flask contains 3.4 µg of O2 at 17â—¦C. What is the pressure? Answer in units of Torr.

A 23 L flask at 258 K and 17 Torr contains nitrogen. What mass of nitrogen is present? Answer in units of g.

A 18.6 g sample of krypton exerts a pressure of 120 mTorr at 51â—¦C. What is the volume of the container?

A 2.1 µL ampoule of xenon has a pressure of 2 Torr at 10 â—¦C. How many Xe atoms are present? Answer in units of atoms.

A lungful of air (307 cm3 ) is exhaled into a machine that measures lung capacity. If the air is exhaled from the lungs at a pressure of 2.23 atm at 34.7 â—¦C but the machine is at ambient conditions of 0.958 atm and 23 â—¦C, what is the volume of air measured by the machine? Answer in units of cm3