1.) A balloon is floating around outside your window. The temperature outside is

Question

1.) A balloon is floating around outside your window. The temperature outside is -13 C , and the air pressure is 0.700 atm . Your neighbor, who released the balloon, tells you that he filled it with 3.70 moles of gas. What is the volume of gas inside this balloon?

Express your answer to three significant figures and include the appropriate units.

2.)A 12.0 L gas cylinder is filled with 8.80 moles of gas. The tank is stored at 35 C . What is the pressure in the tank?

Express your answer to three significant figures and include the appropriate units.

3.)A 180. L kiln is used for vitrifying ceramics. It is currently operating at 845 C , and the pressure is 0.9000 atm . How many moles of air molecules are within the confines of the kiln?

Express your answer to three significant figures and include the appropriate units.

4.) A 12.0 L gas cylinder has been filled with 5.80 moles of gas. You measure the pressure to be 4.00 atm . What is the temperature inside the tank?

Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

.1)

temperature = -13 C + 273 = 260 K

pressure = 0.700 atm

moles = 3.70

PV = nRT

0.7 x V = 3.7 x 0.0821 x 260

V = 112.8 L

volume of gas = 113 L

2)

volume = 12.0 L

moles = 8.80

temperature = 35 C + 273 = 308 K .

PV = nRT

P x 12.0 = 8.8 x 0.0821 x 308

P = 18.5 atm

pressure = 18.5 atm

3)

volume = 180. L

temperature T = 845 C + 273 = 1118 K

pressure = 0.9000 atm .

P V = n RT

0.9 x 180 = n x 0.0821x 1118

n = 1.76

moles of gas = 1.76

4)

P V = n RT

4 x 12 = 5.80 x 0.0821 x T

T = 101 K = -172 oC

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