Topic: Number Of Paritcles And Valumes Of Gases

##### Number Of Paritcles And Valumes Of Gases

The table below shows the volume and temperature of four different gas samples at 100. kPa.

Which two gas samples contain equal numbers of atoms?

(1) helium and neon

(2) helium and argon

(3) neon and argon

(4) neon and krypton

The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.

Which two samples contain the same number of molecules?

(1) 1 and 2

(2) 1 and 3

(3) 2 and 3

(4) 2 and 4

At STP, which gas sample has the same number of molecules as 2.0 liters of CH_{4}(g) at STP?

(1) 1.0 liter of C_{2}H_{6}(g)

(2) 2.0 liters of O_{2}(g)

(3) 5.0 liters of N_{2}(g)

(4) 6.0 liters of CO_{2}(g)

Which sample at STP has the same number of atoms as 18 liters of Ne(g) at STP?

(1) 18 moles of Ar(g)

(2) 18 liters of Ar(g)

(3) 18 grams of H_{2}O(g)

(4) 18 milliliters of H_{2}O(g)

The table below shows data for the temperature, pressure, and volume of four gas samples.

Which two gas samples contain the same number of molecules?

(1) I and II

(2) I and III

(3) II and III

(4) II and IV

Which sample of gas at STP has the same number of molecules as 6 liters of Cl_{2}(g) at STP?

(1) 3 liters of O_{2}(g)

(2) 6 liters of N_{2}(g)

(3) 3 moles of O_{2}(g)

(4) 6 moles of N_{2}(g)

At STP, a 12.0-liter sample of CH_{4}(g) has the same total number of molecules as

(1) 6.0 L of H_{2}(g) at STP

(2) 12.0 L of CO_{2}(g) at STP

(3) 18.0 L of HCl(g) at STP

(4) 24.0 L of O_{2}(g) at STP

At STP, which gaseous sample has the same number of molecules as 3.0 liters of N_{2}(g)?

(1) 6.0 L of F_{2}(g)

(2) 4.5 L of N_{2}(g)

(3) 3.0 L of H_{2}(g)

(4) 1.5 L of Cl_{2}(g)

At STP, which sample contains the same number of molecules as 3.0 liters of H_{2}(g)?

(1) 1.5 L of NH_{3}(g)

(2) 2.0 L of CO_{2}(g)

(3) 3.0 L of CH_{4}(g)

(4) 6.0 L of N_{2}(g)

At STP, a 1-liter sample of Ne(g) and a 1-liter sample of Kr(g) have the same

(1) mass

(2) density

(3) number of atoms

(4) number of electrons

At 23°C, 85.0 grams of NaNO_{3}(s) are dissolved in 100. grams of H_{2}O(ℓ).

Convert the temperature of the NaNO_{3}(s) to kelvins.

Allow 1 credit for 296 K.

Convert the melting point of mercury to degrees Celsius.

Allow 1 credit for −39°C.

The equation below represents a reaction between propene and hydrogen bromide.

Cyclopropane, an isomer of propene, has a boiling point of –33ºC at standard pressure and is represented by the formula below.

Convert the boiling point of cyclopropane at standard pressure to kelvins.

Allow 1 credit for 240. K. Significant figures need not be shown.

Some properties of the element sodium are listed below.

- is a soft, silver-colored metal
- melts at a temperature of 371 K
- oxidizes easily in the presence of air
- forms compounds with nonmetallic elements in nature
- forms sodium chloride in the presence of chlorine gas

Convert the melting point of sodium to degrees Celsius.

Allow 1 credit for 98°C.

Cylinder A has a movable piston and contains hydrogen gas. An identical cylinder, B, contains methane gas. The diagram below represents these cylinders and the conditions of pressure, volume, and temperature of the gas in each cylinder.

Compare the total number of gas molecules in cylinder A to the total number of gas molecules in cylinder B.

Allow 1 credit. Acceptable responses include, but are not limited to:

• The number of gas molecules in cylinder A is the same as the number of gas molecules in cylinder B.