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Using Hess's Law to Calculate an Unknown heat ^ H Nitrogen oxides undergo many interesting reactions in the environment and in industry. Given the following information, calculate H for the overall equation: 2 NO2(g) + 1/2 O2(g) N2O5(s). 4 NO(g) + 3 O2(g) 2 N2O5(s), H = -447.4 kJ 2 NO(g) + O2(g) 2 NO2(g), H = -114.2 kJ heat
Suppose that the microwave radiation has a wavelength of 10.8cm . How many photons are required to heat 295mL of coffee from 25.0 ^\circ \rm C to 62.0 ^\circ \rm C
Calculate the concentration of IO3- in a 3.02 mM Pb(NO3)2 solution saturated with Pb(IO3)2. The Ksp of Pb(IO3)2 is 2.5 × 10-13. Assume that Pb(IO3)2 is a negligible source of Pb2 compared to Pb(NO3)
3.8 g of a hydrocarbon fuel is burned in a calorimeter that contains 234 grams of water initially at 25.00 ?C. After the combustion,the temperature is 26.55 ?C.
The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is?
In the laboratory, a student named Georgia weighed 4.75 grams of an unknown solid mixture containing benzoic acid, copper (II) sulfate and sand. She added 15mL of acetone to her sample. Which component of the mixture is dissolved in the acetone?
An electron in the n2= 5 level of an H atom emits a photon of wavelength 1282.17 nm. To what energy does the electron move. Is the photon in the visible region.
Considering the condensation of a vapour only on cold vertical tubes, what factors affect the prediction of the value of the heat transfer
Calculate the number of molecules inside the cell, which is 2.2 ?m long and 1.2 ?m in diameter.
To make 1.50 L of 0.100 M NaCl from a 3.13 M stock solution,you would need to take ( blank) mL of the stock solution and add (blank) mL of water
Calculate the volume of carbon dioxide formed at a pressure of 2.50 atm and a temperature of 1250C.
Why is sulfuric acid, rather than hydrochloric acid, used to catalyze the dehydration of alcohols?2. A sample of 150 mg of an organic compound is dissolved in 7.5 ml of water. The solution is paced in a 20-cm polarimeter tube and the rotation meas..
Consider the 1H19F molecule. The bond length of 1H19F is 91.7 pm. The wavenumber of light associated with a transition from the ground vibrational state to the first excited state is 1159.18 cm^-1.
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