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 -5 C , and the air pressure is 0.800 atm . Your neighbor, who released the balloon, tells you that he filled it with 4.50 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 balloon is floating around outside your window. The temperature outside is -5 C , and the air pressure is 0.800 atm . Your neighbor, who released the balloon, tells you that he filled it with 4.50 moles of gas. What is the volume of gas inside this balloon? Express your answer to three significant figures and include the appropriate units.

3.A 300. L kiln is used for vitrifying ceramics. It is currently operating at 1055 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.

Explanation / Answer

1. ideal gas equation

PV = nRT

P = pressure of gas = 0.8 atm

V = volume of gas = 124 L

n = No of mol of gas = 4.5 mol

R = gas constant = 0.0821 l.at.k-1.mol-1

T = temperature of gas = -5 c = 268.15 k

0.8*V = 4.5*0.0821*268.15

V = 124 L

3.

PV = nRT

P = pressure of gas = 0.9 atm

V = volume of gas = 300 L

n = No of mol of gas = ? mol

R = gas constant = 0.0821 l.at.k-1.mol-1

T = temperature of gas = 1055 c = 1328.15 k

0.8*300 = n*0.0821*1328.15

n = 2.20 mol

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