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A sample of ethanol, C2H5OH, weighing 2.840g was burned in a colorimeter. The temperature of the calorimeter rose from 25C to 33.73C. If the heat capacity of the calorimeter was 9,630 J/C, what is the value of delta H for the combustion reaction in KJ/mol.
It is often necessary to do calculations using scientific notation when working chemistry problems. For practice, perform each of the following calculations
The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 115 J of heat. As it expands, it does 77 kJ of work. what is it change in internal energy for the system?
At constant pressure and 25 degrees celcius a sample of gas occupies 4.5 liters. At what temperature will the gas occupy 9.0 liters?
If the reaction 2H2S(g) 2H2(g) + S2(g) is carried out at 1065C, Kp = 0.0120. What is the value of Kc for the reaction H2(g)+1/2S2(g) H2S(g) at 1065C ?
A trainee in a medical laboratory will be released to work on her own when her results agree with those of an experienced lab technician at the 95% confidence level. Following are the results from a blood urea level:
what mass of H2O is required to form 1.6 l of O2 at a temperature of 273 k and pressure of .936 atm
Calculate the pH after 0.020 mol NaOH is added to 1.00 L of a solution which is 0.100 M NH2OH and 0.100 M HONH3Cl.
When adding ethylene glycol to your cooling system, it is usually mixed 50:50 by volume. This will prepare a 52.7 mass % solution. Convert this concentration to molality and predict the freezing point depression
10 logarithmic scale of hydrogen ion concentration Be careful If pH = -log [H+ ], what does [H+ ] equal? If the pH of an aqueous solution is 3.50 at 25 C, what is the hydroxide ion concentration?
For the reaction, A = B + C, the rate law is k[A]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant.
How many grams of water can be cooled from 34°C to 26°C by the evaporation of 81 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g·K.)
The yield of the reaction to form your chalcone is not quantitative. What side products might be formed from your aldol condensation?
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