6.) Suppose that student performed the experiment and calculations perfectly in
ID: 1064526 • Letter: 6
Question
6.) Suppose that student performed the experiment and calculations perfectly in the atomic spectra experiment except for the following: unknown to the student, the diffraction gratings rating (number of grooves/cm) was less than the label indicated. would the student calculations frequency for the yellow line of the mercury be equal to , higher than or lower than the true value. Explain
7.) when a sample of Ba (CIO3)2 was decomposed, 273 mL of dry O2 were obtained at a temperature of 24°Cities and an atmospheric pressure of 1.189 atm.
Ba (CIO3)2 (s) (aq) BaCI2 (aq) + 3 O2 (g)
A) How many Mol of O2 gas were produced? show work
B) How many grams of Ba (CIO3)2 (MM=304.3) were decomposed.
Explanation / Answer
Ba (CIO3)2 (s) (aq) ---> BaCI2 (aq) + 3 O2 (g)
(A)
We know that ideal gas equation is PV = nRT
Where
T = Temperature = 24 oC = 24+273 = 297 K
P = pressure = 1.189 atm
n = No . of moles = ?
R = gas constant = 0.0821 L atm / mol - K
V= Volume of the gas = 273 mL = 0.273 L
Plug the values we get n = (PV)/(RT)
= 0.0133 moles
Therefore the number of moles O2 produced is 0.0133 mol
(B) From the balanced reaction ,
1 mole of Ba (CIO3)2 produces 3 moles of O2
M moles of Ba (CIO3)2 produces 0.0133 moles of O2
M = ( 0.0133x1)/3
= 4.44x10-3 moles
So mass of Ba (CIO3)2 decomposed , m = number of moles x molar mass
= 4.44x10-3 moles x 441.5 g/mol
= 1.959 g
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