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Determine the minimum excitation energy of an electron constrained to rotate in a circle of radius equal to the Bohr radius (the value of Bohr predicts for the electron-hydrogen distance in the n=1 state) around a fixed point. Determine the quantum numbers of the initial and final state, and find the excitation wavelength. (the system described here represents an early attempt to model the H atom)
When 83.6 joules of heat is added to 2 grams of water at 10 degrees Celsius, the temperature of the water increases to what value?
Calculate the volume of a solution NaOH c=0.2 mol/l necessary to neutralize v=200 ml of solution HCl c=0.1 mol/l.
What mass of formaldehyde gas must be released from building materials to produce a concentration of 50 ppm of the gas in a room with dimensions of 4m*5m*2m?
an evacuated empty 276 ml glass bulb weighs 129.6375 g. filled with an unknown gas the bulb weighs 130.0318 g.
When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained. Determine the simplest formula of the compound X.
Two objects at different temperatures are placed in a perfectly insulated calorimeter. When the system reaches equilibrium, which of the following statements is true?
From a consideration of the Lewis structure of the thiocyanate ion, SCN-, in which carbon has a double bond with both the sulfur and nitrogen atoms, the formal charges on the sulfur, carbon, and nitrogen atoms are, respectively,
For the reaction below, when 216g of ICl3 reacts with 61.3g of H2O; 2ICl3(s) + 3H2O(l)= ICl(aq)+HIO3(s)+5HCl(aq) a. which is the limiting reagent b. How many grams of HIO3(s) are formed c. How many grams of the nonlimiting reagent are left over
A 1.992g sample of octane, C8H18, is burned in a calorimeter that has a calorimeter constant of 144 J/celcius and contains 750.0g of water. the temperature of the water rose from 14.73 celcius to 42.78 celcius. Determine the enthalpy of combustion..
The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0x10^- 13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm.What fraction of the space within the atom is occupied by the nucleus?
What is the final temperature (in oC) of a 37.6 g sample of graphite (specific heat = 0.720 J/(g K)) which absorbs 9.82 kJ of heat when it warms from 12.56oC
A volume of 110.mL of H2O is initially at room temperature (22.0 °C). A chilled steel rod at 2.00 °C is placed in the water. If the final temperature of the system is 21.1 °C , what is the mass of the steel bar?
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