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Fasten a piece of aluminum foil over the opening of a clean 125 mL Erlenmeyer flask. Make a tiny hole in the conter of the foil with a pin. WEIGH THE DRY FLASK with foil cap/ Secure about 3 mL of unknown liquid and pour it into the flask, replacing with the foil cap. Record the number of the unknown (REWEIGHING IS NOT NECESSARY). As it boils away, the vapor of the unknown pushes the aire out of the flask through a tiny pinhole opening, and eventually the flask is filled witha an atmosphere composed exlcusively of the unknown. The P, V, and T of the vapor will be determined and number of moles will be c alculated. When the flask is allowed to cool the vapor condenses and aire again refulls the flask. Re weighing the flask and figure out the the wight of the unknown vapor which filled the flask during the boiling.
Q: Explain why it is not necessary to know the weight of the unknown liquid placed in the flask.
The excess of acid needed 16ml of 0.25M Naoh for neutralization. then Calculate the percentage of calcium carbonate and magnesium carbonate?
Suppose that an excess of propane, C3H8 burns in 320 g of O2. How many moles of H2O will be formed
As a scuba diver descends under water, the pressure increases. At a total air pressure of 2.96 atm and a temperature of 25.0 C, what is the solubility of \rm N_2 in a diver's blood?
which compound do you expect to have a larger Rf value in a soluvent of medum polarity (such as ethyl acetate): acetominophen or phenacetin?
When 31.7mL of 0.235M Potassium hydroxide is required to completely neutralize 26.0mL of a HC 2 H 3 O 2 solution, calculate the molarity of the acetic acid solution.
Draw on a P-V diagram the following processes. Label accurately each point in the four steps of the cycle using p,V,T for variables e.g. Va. The working substance is a perfect gas. Start from A. Show direction of change using arrow heads.
base catalyzed reaction of vanillin with acetic anhydride? They produce slightly different products, but how and why
silver iodide in grams will dissolve in a solution that is a 2.0 x 10^-4 M silver nitrate when the system reaches equilibrium
A reaction of the form aA---->Products gives a plot of ln[A] vs time (in seconds) which is a straight line with a slope of -7.35e-3. Assuming [A]0=0.0100M,
A gas sample containing 1.65 mol at 25°C exerts a pressure of 413 torr. Some gas is added to the same container, and the temperature is increased to 50.°C.
A mixture of 82.49 g of aluminum ( Picture = 26.98 g/mol) and 117.65 g of oxygen ( Picture = 32.00 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is ..
The freezing-point depression of a 0.100 m (molality) MgSO4 solution is 0.225 degrees Celsius. Determine the experimental van't Hoff
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