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Calculate the amount of heat energy required to convert 55.0 g of water at 62.5 degrees Celsius to steam at 124.0 degrees Celsius. A) 1.35 x 10^2 kJ B) 2.25 x 10^3 kJ C)1.23 x 10^2 kJ D) 0.862 kJ E) 2.67 kJ
Fluorine-18, which has a half-life of 110 min, is used in PET scans. (see section 4.5.) If 100 mg of fluorine-18 is shipped at 8 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:..
you have a 30.0 L cylinder of helium at a pressure of 132 atm and a temperature of 24 degrees Celsius. the He is used to fill balloons to a volume of 3.00 L at 1.07 atm and 29 degrees Celsius.
A stock solution is prepared by adding 10 mL of 2.5 M Ba(CN)2 to enough water to make 23 mL. What is the CN- concentration of 5 mL of the stock solution
How many moles of magnesium and moles of chlorine ions are present in 123.4 mL of a .345 M solution of magnesium chloride
A 0.140-mole quantity of M(NO3)2 is added to a liter of 1.030 M NaCN solution. What is the concentration of M2 ions at equilibrium?
Calculate the diffusion limiting current for the oxidation of an organic compound at an electrode in stagnant solution. Assume 6 electrons are involved in the reaction (n=6). C(org) = 0.01 M, D(org) = 2x10^-5 cm^2/s.
What is the percent yield of a reaction in which 260. g phosphorus trichloride reacts with excess water to form aqueous phosphorus acid (H3PO3) and 127 g HCl?
You have a radiocarbon sample analyzed and find out that the sample has 60% of the modern level of radiocarbon. Calculate the radiocarbon age of the sample using an assumed 5730-year half-life.
How much heat is required to warm 223 g of ice from -44.3°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
A sample consisting of various gases contains 3.4 10-6 mole fraction of radon. This gas at a total pressure of 33 atm is shaken with water at 30°C. Calculate the molar concentration of radon in the water.
Initially a mixture contains 0.795 mol each of N2 and O2 in an 8.00 L vessel. Find the equilibrium composition of the mixture at 3900 degrees Celcius.
What is the equilibrium concentration of hydronium ion in a solution that is 0.0877 M in HX and 0.240 M in X1- ion?
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