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A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater Lake (in Oregon) gave 7.0 disintegrations of carbon-14 nuclei per minute per gram of total carbon. Present-day carbon (in living matter) gives 15.3 disintegrations per minutes per gram of total carbon. Determine the date of the volcanic eruption. Recall that the half-life of carbon-14 is 5730 y.
Wpump = 1500 kJ/h = 0.42 kW Qboil = 2.59 x 106 kJ/h = 718.7 kW Wturb = -227,300 kJ/h = -63.1 kW Qcond = -2.36 x 106 kJ/h = -656 kW What is the efficiency of the engine? How should we define it?
How much heat (kJ) is absorbed/ released? b. What is the change in internal energy (kJ) if the reaction results in a volume change of - 2.78 L?
A cylinder equipped with a piston expands against an external pressure of 1.58 atm. If the initial volume is 0.485 L
How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution.
What is the mass flow rate of methane into the heat exchanger? 162 kg/min, What rate of heat is supplied to the methane stream in order to heat it from 35.0°C to 75.0°C? 250 kW
Calculate the values of q, w, delta U, and delta H for the reversible adiabatic expansion of 1 mole of a monatomic ideal gas from 5.00 m^3
explain in detail, using thermodynamics principles, why the mixing of pure chemicals to form homogeneous mixture is a so-called spontaneous process
Why don't we observe the deBroglie wavelength of everyday macroscopic objects (such as a moving car or a thrown baseball)? The wavelength is too small relative to the size of macroscopic objects to be observed.
Calculate the weight percent composition of the mixture (hexane, heptanes, hexanol, and toluene). b. Calculate the mole percent composition of the mixture.
The compound BeBr2 has a total of how many shared electrons and how many non-bonded electrons?
What is the pH of the solution which results from mixing 25 mL of 0.30 M HF(aq) and 25 mL of 0.30 M NaOH(aq) at 25 ºC? (Ka of HF = .00072)
calculate the partial pressue of nitrogen? What is the initial pressue of nitrogen?
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