How much heat in kilojoules is evolved
How much heat in kilojoules is evolved in converting 36.0 g steam at 180 degrees C. to ice at -60 degrees C. (heat capacity of steam is 1.184 J/g-c & ice is 2.09 J/g-c, the heat vaporization is 40.7 kj/mole and heat fusion is 6.02 kj/mole.)
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A hair dryer has a power rating of 12000w at 120v rms. assume that the hair dryer is the only resistance in the circuit. What is the resistance of the heating element?
A red laser pointer emits light at a wavelength of 808 nm. If the laser emits 7.50E-4 J of energy per second in the form of visible radiation, how many moles of photons per second are emitted from the laser?
If 3 mol of hydrogen is now added to the equilibrium miaxture , what is the new equilibrium concentration of ammonia ?
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.35 x 103 N, is applied for 1.7 x 10-2 s at a point 1.67 m above the floor. The boxer has a moment of inertia of 79.2 kg · m2 for rotation about an
How much ice in grams would have to melt to lower the temperature to 468 ml of water from 39 degrees C. to 2 degrees C. (Assume the density of water is 1.00 g/ml, the heat of fusion for water at 0 degrees C. is 6.02 kj/mole)
How would you prepare a liter of "carbonate buffer" at a pH of10.10? you are provided with H2CO3, NaHCO3, and Na2CO3.
A proton has an initial speed of 4.9 x 105 m/s. (a) What potential difference is required to bring the proton to rest?
Radioactive iodine , 131I which is frequently used in tracer studies involving the thyroid gland, decays according to N= N0 (0.5) t/8 , where N0 is the initial dose and t is the time in days. Find the half life of 131I .
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