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1. Calculate delta U of a gas for a process in which the gas absorbs 3 J of heat and does 10 J of work by expanding?
2. What is the energy of a photon of electromagnetic radiation with a frequency of 5.98 x 1014 Hz?(c= 3.00 x 108m/s, h= 6.63 x 10-34J·s)
an 85.0-ml aqueous solution contains 7.54 g iron ii chloride fecl2calculate molarity of the solution.what is the mass
degrees celsius was added to an insulated vessel containing 50.0 g ice and 25.0 g water at 0 degrees celsius. What mass of liquid water is present in the vessel at the end?
a 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg c. what is the final temperature of the water after
The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom. Calculate the wavelength of this radiation
The rate constant (k) for a reaction was measured as a function of temperature. A plot of ln k versus 1/T (in K) is linear and has a slope of -7445 K. Calculate the activation energy for the reaction
Calculate the pH of a solution conposed of 0.0831M ammonia (NH3) and 0.113M ammonium chloride (NH4Cl).
A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? What assumption is made about the origin of the argon-40?. Enter your answer in scientific notat..
Concentrated sodium hydroxide (NaOH) is 19.4 M, has a density of 1.54 g/mL, and is a strong electrolyte. What is the molality of 19.4 M NaOH? Assume NaOH(aq) dissociates completely to produce two moles of ions per mol NaOH
Once the solvent front reaches the top of the chromatographic paper,solvent begins to evaporate from the top edge of the paper, and the remaining solvent continues to move up the paper.
Write an equation, using the curved-arrow notation, for the acid-base reaction that will take place when each of the following are mixed. If no appreciable acid-base reaction takes place
The temperature is increased to 45 degree celcius then determine what is the pressure in the cylinder
How many moles of SCN-1 are there in 10.0 mL of a 0.000100 M soulution? How many grams. Show me step by step how to do these problems.
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