in a forest , an ecologist measured an area of 100 m^2 .she identified and counted all the tress in that portion of the forest .her data were as follows
type of tree #of tress per 100 m^2
Maple 87
Oak 66
Birch 38
pine 29
Determine the percentage compostion by volume of each species of tree in forest.
how do i find out the answer
2007-09-26 18:02:27 · 2 answers · asked by lisandra 1 in Education & Reference ➔ Homework Help
Write the fraction:
type of tree/total number of trees
and change to percent.
Total number of trees = 87 + 66 + 38 + 29 = 220
Percentage maples = 87/220 = 0.3955 = 39.55 %
Percentage oak = 66/220 = 0.3 = 30%
Percentage birch = 38/220 = 0.1727 = 17.27%
Percentage pine = 29/220 = 0.1318 = 13.18%
2007-09-26 22:34:38 · answer #1 · answered by jsardi56 7 · 0⤊ 0⤋
NaCl mol.mass = Na:23 + Cl:35.5 = 58.5g/mol. Of this, Na = 23 / 58.5 x 100% = 39.32% Sodium. Cl = 35.5 / 58.5 x 100% = 60.68% Chlorine.
2016-05-19 21:51:11 · answer #2 · answered by ? 3 · 0⤊ 0⤋