air有咁多成份
點計到係29?
2006-10-21 19:23:03 · 2 個解答 · 發問者 2003 2 in 科學 ➔ 化學
As air is mainly composed of 80% nitrogen and 20% oxygen
the molecular mass can be calculated as follow
giving the the relative atomic mass of N is 14 and O is 16
i.e. N2 = 14(2) = 28 and O2 = 16(2) = 32
28(0.8)+32(0.2)
= 22.4 + 6.4
= 28.8
2006-10-21 19:43:01 · answer #1 · answered by Kang 1 · 0⤊ 0⤋
It should be called as molar mass rather than molecular mass since air is not a compound.
2006-10-21 20:11:31 · answer #2 · answered by ? 7 · 0⤊ 0⤋