Exam 10: Gases: Their Properties and Behavior

An unknown gas contains 83% C and 17% H by mass.If effuses at 0.87 times the rate of CO₂ gas under the same conditions.What is the molecular formula of the unknown gas?

The molecule believed to be most responsible for global warming is ________.

How many liters of SO₃(g)are produced at 25°C and 1.00 atm from the combustion of 1.00 kg of coal which is 1.00% S by weight? Assume all the sulfur in the coal ends up as SO₃.

Which statement about real gases is true?

A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish. -Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20°C to -20°C?

What is the Celsius temperature of 100.0 g of chlorine gas in a 45.0-L container at 800 mm Hg?

Effusion of a 1:1 mixture of two gases,represented by unshaded and shaded spheres in the diagram below,through a small pinhole produces the result shown below.The shaded spheres have a molecular mass of 32 amu.Which gas molecules have the higher average speed and what is the molecular mass of the unshaded molecules?

If the pressure in a gas container that is connected to an open-end U-tube manometer is 126 kPa and the pressure of the atmosphere at the open end of the tube is 732 mm Hg,the level of mercury in the tube will

Pressure is defined as

Gases do not behave ideally under conditions of ________ pressure and ________ temperature.

Assume that you have a sample of gas in a cylinder with a moveable piston,as shown in diagram (1).The initial pressure,number of moles,and temperature of the gas are noted on the diagram. -Which diagram (2)-(4)most closely represents the result of doubling the pressure and doubling the temperature while keeping the number of moles of gas constant?

The pressure in the eye of a hurricane is less than atmospheric pressure.Which one of the following pressure readings could not have been taken in the eye of a hurricane?

You are given two flasks of equal volume.One contains H₂ at 0°C and 1 atm while the other contains CO₂ at and 2 atm.Which of the following quantities will be the same for both flasks?

If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 700 mm Hg,the level of mercury in the tube will be

According to Graham's law,the rate of effusion of a gas is inversely proportional to the ________.

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain diffusion of a gas?

In the laboratory,hydrogen gas is usually made by the following reaction: Zn(s)+ 2 HCl(aq)→ H₂(g)+ ZnCl₂(aq) How many liters of H₂ gas,collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C,can be made from 2.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C.

At 298 K which is larger rate of effusion or rate of diffusion?

When 12.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

A container filled with gas is connected to an open-end U-tube manometer that is filled with mineral oil.The pressure in the gas container is 770 mm Hg and atmospheric pressure is 754 mm Hg.What will be the difference in the levels of mineral oil in the two arms of the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?