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8.4: Unit 8 Practice Problems

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    Question 1. 

    If the pressure inside a tank is 100. psi, what is this pressure in kPa, mPa, atm, mmHg?

    \[\mathrm{100\: \cancel{psi.} \times \dfrac{101\: kPa}{14.7\:\cancel{psi.}}=687\: kPa}\]      \[\mathrm{100\: \cancel{psi.} \times \dfrac{0.101\: MPa}{14.7\:\cancel{psi.}}=0.687\: MPa}\]     \[\mathrm{100\: \cancel{psi.} \times \dfrac{1\: atm}{14.7\:\cancel{psi.}}=6.8\: atm}\]    \[\mathrm{100\: \cancel{psi.} \times \dfrac{760\: mmHg}{14.7\:\cancel{psi.}}=5170\: mmHg}\]

    Question 2. 

    A gas occupies a volume of 17.4L at 11.2 psi, what will it's volume be if the pressure is increased to 13.6psi and the temperature is held constant?

    P1V1 = P2V2    (11.2psi)(17.4L) = (13.6psi)(V2 )       V2 = 14.3L

    Question 3.

    A gas has a volume of 186mL at 32°C, what will it's volume be if the temperature of the gas is increased to 104°C and the pressure is held constant?

    V1/T1 = V2/T2  Remember that when using gas laws, temperature should always be in K.  (186mL) / (305K)  = (V2) / (377K)        V= 230mL

    Question 4. 

    A container of neon at a pressure of 550mmHg and a temp of 120°C is heated (at a constant volume) until the temperature is 360°C.  What is the new pressure of the heated neon?


    P1/T1 = P2/T2  Remember that when using gas laws, temperature should always be in K.  (550mmHg) / (393K)  = (P2) / (633K)        P= 890 mmHg

    Question 5. 

    A cylinder containing 12.0L of compressed air at 23.0atm and -20.0°C is opened and the air escapes into a room which has a pressure of 0.960atm and warms to 28.0°C, what is the final volume of the air from the cylinder?



     Question 6. 

    If a gas has a volume of 19.8L at standard temperature and pressure (STP),  how many moles of gas are there?



    Question 7.  

    If 1.0 grams of a gas occupies a volume of 330mL at STP, what is the molecular weight of the gas?



    Question 9.  

    A gas occupies 6.4L at 102kPa and 294K, what will the temperature of the gas be at 8.7L and 97kPa?  



    Question 10. 

    If I have 2.6 moles of a gas at a pressure of 4.3 atm and a volume of 8.4 liters, what is the temperature? (R=0.0821 L*atm/mol*K)



    8.4: Unit 8 Practice Problems is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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