The combined and ideal gas laws

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A balloon holds 12.3 L of air at 1 atm and 300 K. Using R = 0.08206 L·atm/(mol·K), how many moles of gas is that, to 0.01 mol, Ari?

   0.5 mol
2. 2.

   A sealed bag holds 10 L of air at 2 atm and 290 K. Using R = 0.08206 L·atm/(mol·K), how many moles of gas is that, to 0.01 mol, Bo?

   0.84 mol
3. 3.

   Pressure is in atm and volume in liters. Which value of R fits PV = nRT, Jun?

   • 8.314 L·atm/(mol·K)
   • 0.08206 L·atm/(mol·K)
   • 22.4 L·atm/(mol·K)
4. 4.

   Pressure is in pascals and volume in cubic meters. Which value of R fits PV = nRT, Luz?

   • 0.08206 J/(mol·K)
   • 8.314 J/(mol·K)
   • 101.325 J/(mol·K)
5. 5.

   Why are there two values of R, 0.08206 and 8.314, Milo?

   • They come from two different gases
   • They are one constant in two sets of units
   • One is for gases and one for liquids
6. 6.

   In PV = nRT, what does n stand for, Noah?

   • The amount of gas, in moles
   • The mass of gas, in grams
   • The number of liters
7. 7.

   In PV = nRT, which unit must T be in, Pia?

   • Kelvins
   • Degrees Celsius, as on a thermometer
   • Either °C or K, since they match
8. 8.

   A gas at 17 °C goes into PV = nRT. Which value of T is used, Ren?

   • 256.15, from 273.15 − 17
   • 17, the Celsius reading
   • 290.15 K
9. 9.

   Which rearrangement of PV = nRT gives n, Tala?

   • n = PV ÷ (RT)
   • n = PVRT
   • n = RT ÷ (PV)
10. 10.

    Which rearrangement of PV = nRT gives V, Zee?

    • V = nRT ÷ P
    • V = P ÷ (nRT)
    • V = nRTP