Calculate the % error if a student completes the molar mass of ethanol experiment and determine the molar mass to be 49.19 g/mol when the actual molar mass of ethanol is 46.07 g/mol. (show your work) % error = |Experimental value - Actual value|/ Actual value x 100.
As given % error = [(Experimental value- Actual value) × 100 ] / Actual value
Experimental value = 49.19 g/mol
Actual value = 46.07 g/mol
% error = [(49.19-46.07) × 100] / 46.07 = 6.77%
Calculate the % error if a student completes the molar mass of ethanol experiment and determine...
A student devised an experiment to determine the molar mass of an unknown gas X. Firstly, he filled a glass gas syringe (accurate to ± 0.5 cm3 ) with 100 cm3 of air then placed a rubber seal over the nozzle and weighed the syringe. He then emptied the gas syringe, refilled it with 100 cm3 of the unknown gas X, replaced the rubber seal and reweighed the syringe. Finally, he measured the temperature of the room. He obtained the...
Calculate the mass of ethylene glycol (C2H6O2 - molar mass =62.07 g/mol) that must be added to 1.00 kg of ethanol (C2H5OH- molar mass =46.07 g/mol) to reduce its vapor pressure by 10.0 torr at 35 degree C. The vapor pressure of pur ethanol at 35 degree C is 100 torr.
a solution of C2H6O ethanol molar mass is 46.07 g / mol in water can be used to disinfect. A liter of this solution contains 533g of ethanol and 355. of water 18.02 g / mol. What is the lolar fraction of ethanol in this solution.
Calculate the heat released when 135 grams of ethanol C2H5OH, burns. The heat of combustion of ethanol is 1233 kJ/mol. Molar mass of ethanol C2H5OH = 46.07 g/mol C2H5OH(g) + 3 O2(g) → 2 CO2 (g) + 3 H2O(l) LaTeX: \DeltaΔH = -1233 kJ/mol
Calculate the amount of heat energy required to evaporate 35.0 g of ethanol, CH3CH2OH, at 78.4ºC, ethanol's boiling point. (The molar heat of vaporization of liquid ethanol is 3.86 × 104 J/mol. The molar mass of ethanol is 46.07 g/mol.)
A student determined the molar volume of CO2 gas using the procedure described in this experiment? He collected the following data. mass of empty Mylar balloon and fastener,g 3.03 mass of Mylar balloon, fastener, and CO2 gas, g 3.99 volume (capacity) of Mylar balloon, mL 1730 barometric pressure, in. Hg = 28.96 laboratory temperature, C = 22 a)express the pressure in atmospheres. [Note: 1 atm = 29.92in. Hg] b)express the temperature in Kelvin c)express the volume of the balloon in...
In an experiment to determine the molar mass of an unknown compound I experimentally found a molar mass of 68.47 g/mol the actual molar mass is 138.1 g/mol What errors could I have made or why did this happen?
Determine the mole fraction of ethanol, C2H5OH (Molar mass = 46.08 g/mol) when 12 grams of ethanol is dissolved in 49.7 grams of water, H2O (Molar mass = 18.02 g/mol).
A student designed his experiment based on Dumas method to determine the molecular 5 Pts mass of an unknown volatile liquid and tabulated the data obtained from his cxpcriment. From the given data calculate the Molar mass of the unknown liquid and percent error if the accepted molar mass is Y g/mol. Q8. Mass of flask, boiling stone, foil cap, & unknown liquid after cooling Mass of flask, boiling stone and foil cape Water bath temperature Barometric pressure Volume of...
1. A student reacted 0.200 g of a compound A (molar mass 150&/mol) to obtain 9.30 ggf a comp (molar mass- 300 g/mol) t a) calculate the theoretical yield of B (5 poinbs) c) Calculate the student's percent yield of B (5 points) 2. A student completes the synthesis of an organic compound in the laboratory. The calculated theoretic yield for the reaction is 5g, and according to the literature the product is a white solid with a melting point...