Weighing gases with one equation

Science · Chemistry · ages 16-17

Name ______________________ Date ____________

Convert 25 C to kelvin. Type the number.
Answer: ______________
Which units must go into pV equals nRT?
- Pascals, cubic metres, kelvin
- Kilopascals, cubic decimetres, Celsius
- Any units at all
Real gases fail at high pressure because...
- Particles take up space
- The particles vanish
- The gas constant changes
A 0.2 mol sample of gas weighs 8.8 g. What is its molar mass in g per mol? Type the number.
Answer: ______________
Convert 150 kilopascals to pascals. Type the number.
Answer: ______________
What is 2.5 cubic decimetres in cubic metres?
- 2.5
- 2500
- 0.0025
Which measurement slip hurts a molar mass most?
- Temperature off by a few kelvin
- Mass off by a milligram
- Volume out by a thousand
Chilled toward condensing, a gas reads below ideal pressure. Why?
- Its particles grow bigger
- Attractions pull inward
- R shrinks in the cold

Answer key

For grown-ups. Fold this page away before handing over the rest.

298 · Add 273 to the Celsius reading.
Pascals, cubic metres, kelvin · The equation wants pascals, cubic metres and kelvin.
Particles take up space · Crowded particles leave less free space than V.
44 · Divide the mass by the amount: 8.8 over 0.2.
150000 · Multiply kilopascals by 1000.
0.0025 · Divide cubic decimetres by 1000.
Volume out by a thousand · A thousandfold volume slip dwarfs small slips elsewhere.
Attractions pull inward · Waking attractions pull particles in and lower the pressure.