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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?*

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?*

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

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

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?*

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

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

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

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

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

Base your answers to questions 11 on the information below and on your knowledge of chemistry.

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.*

Convert the melting point of mercury to degrees Celsius.*

Base your answers to questions 13 on the information below and on your knowledge of chemistry.

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.*

Base your answers to questions 14 on the information below and on your knowledge of chemistry.

Some properties of the element sodium are listed below.

Convert the melting point of sodium to degrees Celsius.*

Base your answers to questions 15 on the information below and on your knowledge of chemistry.

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.*