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Problem- For similar light intensity, compact flourescent bulbs use about 25% of the energy of incandesant bulbs. Lets say you replaced a bulb of 75 W with a flourescent bulb and that your utility charges $0.15/kW-hour. How many dollars would you save in electricity in the 10,000-hour lifetime of the bulb?
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The standard free energy of activation of a reaction A is 73.9kJ/mol-1 (17.7 kcal mol-1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature. The products of each reaction are 10.0 kJ mol-1 (2.39 kcal mol-1) mo..
Consider the filling order for electrons. If an atom has the following electron configuration, where would the next electron be placed? [Ne]3s23px23py2 3pz1 Answer a. 3px b. 3py c. 3pz d. 4s e. 4p3
What would the product/structure be if the reaction of methyl benzoate was a subsitution (add H and NO2 to it)?
After the addition of a large excess of the acid solution (in comparision with the acid volume needed to reach the equivalence point). Tell how many milliliters of acid are required to reach the equivalence point.
How does the second law explain why heat travels from a substance at higher temperature to one at lower temperature?
Pure water is at equilibrium with excess CaCO3 (s) and MgCO3 (s). If the water has a pH of 8.61 and is open to the atmosphere (CO2 = 390 ppmv), calculate [Ca2+] and [Mg2+]. (for MgCO3 (s), pKs = 7.45)
at 25 degree c the heat of fusion of al is 10.6 kjmol and the heat of sublimation is 326.4 kjmol. what is the heat of
A 68-kg person exposed to thorium-234 receives 5.0x10^4 B particles, each with an energy of 3.0x10^-14 J. How many rads does the person receive?
if solubility of a particular solute is 10g100g h2o at 20 degrees c which of the following solution concentrations
Give the structure of a hydrocarbon that has six carbon atoms and three vinylic hydrogens and two allylic hydrogens
Ammonia, NH3, reacts with the hypochlorite ion, OCl-, to produce hydrazine, N2H4. How many moles of hydrazine are produced from 5.85 mol of ammonia if the reaction has a 78.2%
A 350.0 gram sample of copper is initially at 25.0 °C. It absorbs 12.50 kJ of heat from its surroundings. What is its final temperature, to the nearest tenth of a degree?
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