A sample of oxygen gas contains 15.0 mol in a volume of 23.5 L. If the pressure and temperature are kept constant, but the volume is changed to 1.90 L, how many moles of oxygen gas does the sample contain? Round your answer to 3 significant figures. mol D.P

Which of the following statements is(are) true? a. If the number of moles of a gas is doubled, the volume will double, assuming the pressure and temperature of the gas remain constant. b. If the temperature of a gas increases from 25C to 50C, the volume of the gas would double, assuming that the pressure and the number of moles of gas remain constant. c. The device that measures atmospheric pressure is called a barometer. d. If the volume of a gas decreases by one half, then the pressure would double, assuming that the number of moles and the temperature of the gas remain constant.

One way to state Boyle’s law is All other things being equal, the pressure of a gas is inversely proportional to its volume. (a) What is the meaning of the term inversely proportional? (b) What are the other things that must be equal?

Chlorine dioxide, ClO2, reacts with fluorine to give a new gas that contains Cl, O, and F. In an experiment, you find that 0.150 g of this new gas has a pressure of 17.2 mm Hg in a 1850-mL flask at 21 C. What is the identity of the unknown gas?

Helium-filled balloons rise in the air because the density of helium is less than the density of air. (a) If air has an average molar mass of 29.0 g/mol, what is the density of air at 25C and 770 mm Hg? (b) What is the density of helium at the same temperature and pressure? (c) Would a balloon filled with carbon dioxide at the same temperature and pressure rise?

A balloon filled with helium gas is found to take 6 hours to deflate to 50% of its original volume. How long will it take for an identical balloon filled with the same volume of hydrogen gas (instead of helium) to decrease its volume by 50%?

Nitrogen monoxide gas reacts with oxygen gas to produce nitrogen dioxide gas. What volume of nitrogen dioxide is produced from the reaction of 1 L nitrogen monoxide gas with 3 L oxygen gas? What volume, if any, of the reactants will remain after the reaction ends? Assume all volumes are measured at the same pressure and temperature.

As 1 g of (lie radioactive element radium decays over 1 year. k produces 1.161018 alpha particles (helium nuclei). Each alpha particle becomes an atom of helium gas. What is the pressure ¡n pascal of the helium gas produced if it occupies a volume of 125 mL at a temperature of 25 C?