Chem 1LD Practical Review Questions With Complete
Solutions
calculate Delta H(vap) from the slope Correct Answers ln P =
(-Delta Hvap / R)*(1/T) + C
R = 8.314 J/ (mol*k)
C= constant
slope will be found from the graph of ln VP vs 1/T (in kelvin)
calculate the "actual volume" of each mixture in the Erlenmeyer
flask Correct Answers Actual volume = mass of erlenmeyer's
mixture / density of mixture
calculate the "additive volume" of the ethanol-water mixture in
the Erlenmeyer flask Correct Answers V(additive) = V(water)
+ V (Ethanol)
calculate the density of ethanol Correct Answers D = mass of
ethanol / 10 mL volumetric flask
calculate the density of the mixture Correct Answers d = mass
of mixture / 10 mL volumetric flask
calculate the density of water in the 10 mL volumetric flask
Correct Answers D = mass of water / 10 mL volumetric flask
calculate the mass of each mixture in the 10 mL volumetric flask
Correct Answers m = mass of flask with mixture - mass of
empty flask
, calculate the mass of each mixture in the erlenmeyer flask (i.e.
"15+5" ethanol + water mixture) Correct Answers m = (V*D
of ethanol) + (V*D of water)
calculate the mass of ethanol Correct Answers m = mass of
flask w/ ethanol - mass of empty flask
Calculate the mass of water Correct Answers m= mass of flask
w/ water - mass of empty flask
calculate the mole fraction of ethanol in the mixture Correct
Answers moles of ethanol / (mole of ethanol + moles of water)
calculate the percent change in volume for the water, the
ethanol, and the mixture. Indicate whether the actual volume is
decreasing or increasing Correct Answers Percent change in
volume = (Actual volume - additive volume) / additive volume *
100
Convert degrees celcius to 1/T (in Kelvin) Correct Answers
change temperature to kelvin then divide by 1
Convert vapor pressure of ethanol into LN (VP) Correct
Answers = ln (VP)
examples of weak ligands Correct Answers F^-1
Cl^-1
water
Find the air pressure at each temperature Correct Answers
P1T1= P2T2 solve for P2
Solutions
calculate Delta H(vap) from the slope Correct Answers ln P =
(-Delta Hvap / R)*(1/T) + C
R = 8.314 J/ (mol*k)
C= constant
slope will be found from the graph of ln VP vs 1/T (in kelvin)
calculate the "actual volume" of each mixture in the Erlenmeyer
flask Correct Answers Actual volume = mass of erlenmeyer's
mixture / density of mixture
calculate the "additive volume" of the ethanol-water mixture in
the Erlenmeyer flask Correct Answers V(additive) = V(water)
+ V (Ethanol)
calculate the density of ethanol Correct Answers D = mass of
ethanol / 10 mL volumetric flask
calculate the density of the mixture Correct Answers d = mass
of mixture / 10 mL volumetric flask
calculate the density of water in the 10 mL volumetric flask
Correct Answers D = mass of water / 10 mL volumetric flask
calculate the mass of each mixture in the 10 mL volumetric flask
Correct Answers m = mass of flask with mixture - mass of
empty flask
, calculate the mass of each mixture in the erlenmeyer flask (i.e.
"15+5" ethanol + water mixture) Correct Answers m = (V*D
of ethanol) + (V*D of water)
calculate the mass of ethanol Correct Answers m = mass of
flask w/ ethanol - mass of empty flask
Calculate the mass of water Correct Answers m= mass of flask
w/ water - mass of empty flask
calculate the mole fraction of ethanol in the mixture Correct
Answers moles of ethanol / (mole of ethanol + moles of water)
calculate the percent change in volume for the water, the
ethanol, and the mixture. Indicate whether the actual volume is
decreasing or increasing Correct Answers Percent change in
volume = (Actual volume - additive volume) / additive volume *
100
Convert degrees celcius to 1/T (in Kelvin) Correct Answers
change temperature to kelvin then divide by 1
Convert vapor pressure of ethanol into LN (VP) Correct
Answers = ln (VP)
examples of weak ligands Correct Answers F^-1
Cl^-1
water
Find the air pressure at each temperature Correct Answers
P1T1= P2T2 solve for P2
