And this the question Data Data Trial 1 Trial 2 Mass of flask A, contents, stopp
ID: 1055470 • Letter: A
Question
And this the question
Data Data Trial 1 Trial 2 Mass of flask A, contents, stopper, and glass tube before reaction Mass of flask A, contents, stopper, and glass tube after reaction Temperature of the gas in flask A Temperature of the gas in flask D Volume of oxygen collected Barometer reading (temperature of barometer Aqueous vapor pressure at temperature of gas (average the two temperatures) 2 oC ml 300 300 to torr torr Aqueous vapor pressure at temperature of gas (average the two temperatures)90
Explanation / Answer
since the flask is filled with oxygen and oxygen is denser than air, air density is 1.29 kg/m3 where as water is 1.43 kg/m3. In the same volume one will have more mass of oxygen. So the flask will be heavier.
if oxygen evolved is saturated with water vapor, some water gets carried over as well as evolved oxygen. because there is less mass in the flask. So the flask becomes lighter.
Volume of solution =100ml, density of the solution =1 g/ml, mass of the solution = 100*1 =100ml= 0.1L
mass of H2O2= 3gm, molar mass of H2O2= 34, moles of H2O2= 3/34=0.088235, Molarity = moles of solute/ per liter of solution = 0.088235/0.1 =0.88235 M
The reaction is H2O2---> H2O+1/2O2
moles of oxygen = 1/2 times the moles of H2O2= 0.5*0.88235=0.441176 moles
moles of O2/moles of H2O2= 0.441176/0.88235=0.5