a 20g soil sample was eated to a constant weight of 15g. when further heated to red hot and cooled, it weighed

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a 20g soil sample was eated to a constant weight of 15g. when further heated to red hot and cooled, it weighed

12g. what is the humus pecentage of the soil?

2006-07-19 01:51:34 · 2 answers · asked by omoh 1 in Science & Mathematics ➔ Biology

2 answers

20%. The first, lesser heating drove off the water, and the second burned off the humus. The percentage of humus in the dry soil was (15 - 12) / 15 or 20%.

2006-07-19 02:09:23 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋

28 per cent

2006-07-19 08:54:13 · answer #2 · answered by The Foosaaaah 7 · 0⤊ 0⤋