Three volatile compounds X, Y, and Z each contain element Q. The percent by weight of element Q in each compound was determined. Some of the data obtained are given below.
Compound---Percent by Weight of Element Q---Molecular Weight
X ----------- 64.8% ---------------------- ?
Y ------------ 73.0% ----------------------- 104.
Z --------------- 59.3% ---------------------- 64.0
(a) The vapor density of compound X at 27 degrees Celsius and 750. mm Hg was determined to be 3.53 grams per liter. Calculate the molecular weight of compound X.
(b) Determine the mass of element Q contained in 1.00 mole of each of the three compounds.
(c) Calculate the most probable value of the atomic weight of element Q.
2007-01-12 00:16:01 · 1 answers · asked by bosox1989 1 in Science & Mathematics ➔ Chemistry
a) For x; MM = dRT/P = 88
b) m = for x = 88. x 0.648 = 57 g
m = for y = 104 x 0.730 = 64.2g
m = for z = 64 x 0.593 = 37.95
c) % = M x 100/aw
M = (aw x%)/100
x = 37.95
y = 75.9
z = 37.95
Atomic weight is probably 37.95 ~= 38
2007-01-12 01:20:41 · answer #1 · answered by docrider28 4 · 0⤊ 0⤋