Using the molar volume in calculations with chemical equations
4 marks · NormalThe table below shows the volumes, in cm³, of a gas collected from several reactions at room temperature and pressure. Fill in the number of moles of gas for each row, using the molar volume of 24,000 cm³ at rtp.
| Volume (cm³) | Moles |
|---|---|
| 6000 | |
| 12,000 | |
| 1800 | |
| 24,000 |
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Must show: Row 1: 0.25, Row 2: 0.50, Row 3: 0.075, Row 4: 1.00
Also accept: Values rounded to 2 or 3 sig fig accepted
Common mistakes: Dividing by wrong molar volume; Forgetting decimal places
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Correct value for 6000 cm³ (0.25)
M2 · 1 mark · Correct value for 12,000 cm³ (0.50)
M3 · 1 mark · Correct value for 1800 cm³ (0.075)
M4 · 1 mark · Correct value for 24,000 cm³ (1.00)
Worked solution
| Volume (cm³) | Moles |
|---|---|
| 6000 | 0.25 |
| 12,000 | 0.50 |
| 1800 | 0.075 |
| 24,000 | 1.00 |