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1.) When 1.550 g of liquid hexane (C6H14) undergoes combustion in a bomb calorimeter, the temperature rises from 25.87 ºC to 38.13 ºC. Find ?E rxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment, is 5.73 kJ/ºC.
2.) The combustion of toluene has a ?E rxn of -3.91 × 103 kJ/mol. When 1.55 g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 ºC to 37.57 ºC. Find the heat capacity of the bomb calorimeter.
The solutions mixed together are 51.7 mL of 0.110 M hydrochloric acid, 102.4 mL of 0.213 M of nitric acid, 500.8 mL of 0.0101 M calcium hydroxide, and 201.7 mL of 0.114 M rubidium hydroxide. Did the acids and bases exactly neutralize each other?
What is the percent yield of ammonia when 150.0 g of nitrogen reacts with 32.1 g of hydrogen if the actual yield is 174 grams?
Vitamin C (L-ascorbic acid; MW = 176.0 g/mol) is a weak acid (pKa = 4.863). Suppose a 500.0 mg tablet is dissolved in water and titrated with 0.100 M NaOH. How many mL of NaOH are required to reach the equivalence point?
A laser pulse with wavelength 540nm contains 4.40mJ of energy. How many photons are in the laser pulse?
Why are acid chlorides more reactive towards nucleophilic substitution than ethyl esters? Give an explanation of why acid chlorides are more reactive toward nucleophilic substition than are the corresponding ethyl esters.
Calculate the percent yield for the reaction: P4 (s) + 6 Cl2 (g) → 4 PCl3 (l) if 75.0 g of phosphorus reacts with excess chlorine gas to produce 111.0 g of phosphorus trichloride.
A reaction mixture initially contains 2.8M H2O and 2.6 M SO2. Determine the equilibrium concentration of H2S if Kc for the reaction at this temperature is 1.3 x 10^-6 ?
Determine the empirical formula for each substance.
what is the balanced equation with notations for steam reacting with solid carbon to form the gases carbon monoxide and hydrogen.
iF 0.80g of a gas occupies 295 mL at 25 degrees Celcius and 680 mm Hg of pressure, what is the molar mass of the gas.
Why do we measure the volume of the flask with water rather than using the volume listed on the side?
Draw the Lewis structure of formic acid, HCO2H. (Hint: C is the central atom. One of the H is bonded to an O.) How do we know which of the possible structures for HCO2H is more likely to be correct?
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