Question 29
SoilIn an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained:
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is
- A.26.7%
- B.16.2%
- C.16.7%
- D.17.6%.
Show the answer and explanation
Answer: C (16.7%)
Explanation
Mass of soil = 101.5 − 80.5 = 21.0 g. Humus burnt off on roasting = 99.0 − 95.5 = 3.5 g. Percentage of humus = 3.5/21.0 × 100 = 16.7%.