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The vapor pressure of ethanol is 400 mmHg at 63.5 degree celsius. Its molar heat of vaporization is 39.3 kJ/mol. What vapor pressure of ethanol, in mmHg, at 34.9 degree celsius
An unknown compound has the empirical formula CH2. A 0.050-mol sample of this compound weighs 4.20 g. What is the molecular formula of this compound?
The flask is then rinsed with 64.6 mL of distilled water and is then used to prepare a standard solution of KNO3. Compute the molar concentration of Cl- in the standard KNO3 solution if the flask is rinsed only one time with distilled water.
Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (C6H5COONa). [Ka = 6.5 ? 10-5 for benzoic acid]
Table salt (NaCl) and sugar (C12H22O11) are accidentally mixed A 5.00g sample is burned and 2.20-g of CO2 are produced. What is the mass percentage of the table salt in the mixture.
non-electrolyte, X was dissolved in 100 g of Benzene, the vapor pressure of the solvent decreased from 100 torr to 93.8 torr at 299 K. Calculate the molar mass of the solute, X.
Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 865 mL of a 36.0% (w/v) sucrose solution?
A large flask with a volume of 936 mL is evacuated and found to have a mass of 134.66g. It is then filled to a pressure of 0.967atm at 31 degrees C with a gas of unknown molar mass and then reweighed to give a new mass of 153.81g. What is the mola..
A quantity of ice at 0°C is added to 66.4 g of water in a glass at 55°C. After the ice melted, the temperature of the water in the glass was 15°C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(..
The DHfus of ethanol (C2H5OH) is 4.60 kJ/mol. How many kilojoules of heat are required to melt 24.5 g of ethanol at its freezing point.
What volume (in milliliters) of 0.100 M NaOH should be added to a 0.120 L solution of 0.024 M glycine hydrochloride
Why is it important to clean the surface of the zinc and copper electrodes with 1 M HNO3 immeadiately before using them in this experiment.
Calculate the specific heat capacity of this sample of mercury if The amount of energy required to heat 2.00 grams Hg from 50 degrees C to 85 degrees C is 9.87 J.
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