Question 1

If the temperature of 34.4 g of ethanol increases from $25.0\degree C$ to $78.8\degree C$ , how much heat has been absorbed by the ethanol? The specific heat of ethanol is $2.44\ \frac{J}{g\cdot\degree C}$ . Round your answer to the nearest whole number.

Accepted Answer

4516

Question 2

A 4.50-g nugget of pure gold absorbed 276 J of heat. The initial temperature was $25.0\degree C$ . The specific heat of pure gold is $78.8\degree C$ . What was the final temperature? Round to the nearest degree.

Accepted Answer

$500\degree C$

Question 3

A sample of helium gas in a balloon is compressed from 4.0 L to 2.5 L at a constant temperature. If the pressure of the gas in the 4.0-L volume is 210 kPa, what will the pressure be at 2.5 L?

Accepted Answer

336 kpa

Question 4

What is the volume of the air in a balloon that occupies 0.620 L at $25.0\degree C$ if the temperature is lowered to $78.8\degree C$ ? Round your answer to two decimal places.

Accepted Answer

0.57 L

Question 5

A gas in a sealed container has a pressure of 125 kPa at a temperature of $25.0\degree C$ . If the pressure in the container is increased to 201 kPa, what is the new temperature? Round to the nearest degree.

Accepted Answer

214 C

Question 6

An unopened, cold 2.00-L bottle of soda contains 46.0 mL of gas confined at a pressure of 1.30 atm at a temperature of $25.0\degree C$ . If the bottle is dropped into a lake and sinks to a depth at which the pressure is 1.52 atm and the temperature is $78.8\degree C$ , what will be the volume of the gas in the bottle? Round your answer to the nearest whole number.

Accepted Answer

39 ml

Question 7

Determine the Kelvin temperature required for 0.0140 mol of gas to fill a balloon to 1.20 L under 0.988 atm pressure. Use R = 0.0821 L atm/mol K and round your answer to the nearest whole number.

Accepted Answer

1031 K

Question 8

A weather balloon is filled with helium that occupies a volume of $25.0\degree C$ at 0.995 atm and $78.8\degree C$ . After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is $2.44\ \frac{J}{g\cdot\degree C}$ . What is the volume of the balloon at the new location? Round your answer to the nearest whole number.

Accepted Answer

59129

Question 9

Use Boyle's Law to calculate the missing value: V₁= 2.0 L, P₁= 0.82 atm, V₂=1.0 L, P₂= ?

Accepted Answer

1.64 atm

Question 10

Use Charles's Law to calculate the missing value: V₁= 250 mL, T₁= ?, V₂=400 mL, T₂= 298 K

Accepted Answer

186.3 K

Question 11

What is the pressure of a fixed volume of hydrogen gas at $25.0\degree C$ if it has a pressure of 1.11 atm at $78.8\degree C$ ? Round to two decimal places.

Accepted Answer

1.17 atm

Question 12

Calculate the number of moles of O₂gas held in a sealed, 2.00-L tank at 3.50 atm and $78.8\degree C$ . Use R = 0.0821 L atm/mol K and round your answer to three decimal places.

Accepted Answer

0.286 mol

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