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During an experiment, a student adds .339 g of calcium metal to 100.0 mL of 2.05 M HCl. The student observes a temperature increase of 11.0 °C for the solution. Assuming the solution\'s final volume is 100.0 mL, the density is 1.00 g/mL, and the specific heat is 4.184 J/(g·°C), calculate the heat of the reaction, ?Hrxn.
Ca(s) + 2H^+(aq) >> Ca^2+(aq) + H2(g)
?Hrxn = ___ kJ/mol
The air in an inflated balloon (defined as the system) warms over a toaster and absorbs 121 J of heat. As it expands, it does 70. kJ of work. What is the change in internal energy for the system.
One mechanism of fragmentation is loss of a neutral radical by cleavage of a bond from which one electron lost. What is the m/z ratio of the most stable cationic fragment that can be generated from dexchlorpheniramine by this mechanism?
carbon disulfide can b made by the reaction of carbon dioxide and sulfur trioxide 2so3(g) + Co2(g) + heat >
concentrated hydrofluoric acid is 28.9M and has a density of 1.18g/mL. What is the weight percent of concentrated HF?
The vapor pressure of pure methyl alcohol at 19 degrees celcius is 90.0 torr and that of pure ethyl alcohol is 40.0 torr. Assume a mixture of methyl alcohol and ethyl alcohol is ideal.
The pH in the stomach of a certain animal is 3.8. This means that the hydrogen ion concentration in the stomach
The decomposition of SO2CL2 to SO2 and Cl2 is first order in SO2CL2 and has a half-life of 4.1 hours. If you begin with 1.6 x 10^-3 moles of SO2CL2 in a flask, how many hours elapse until 2.00x10^-4 moles remain?
What is the osmotic pressure of a solution made from dissolving 95.0 g of glucose, C_6H_{12}O_6, in 725 mL of water at 39.0 degrees C?
This increases to 0.010 Msec^-1 at 90 degrees C. Calculate the activation energy for this reaction.
Pyridine is a heterocyclic aromatic compound similar in structure to benzene. It is widely used as an organic base because it reacts with acids, but is inert to most reagents.Write an equation with structural formulas to show how pyridine reacts w..
A compound has the empirical formula CH2O. When 0.0866g is dissolved in 1.000g of ether, the solution's boiling point is 36.5 degrees C. Determine the molecular formula of this substance.
When the titration reaches the equivalence point, the student finds she has used 91.4 mL of sodium hydroxide solution. Calculate the molarity of the student's sodium hydroxide solution.
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