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Question - A current of 4.25 A is passed through a Pb(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 9.40 g of lead?
I need proficient help in the above problems.
The wind speed is 4.8 m/s on a slightly sunny morning and plume rise is 20 m. (a) Calculate the ground-level centerline concentration 2.0 km downwind from the stack. (b) Calculate the concentration at 100 m off the centerline at the same x distanc..
Alzarin yellow has a pH range of 10.1-12.1. What is its Ka. It is yellow at pH 10 ANd red at pH 12. What is the color of a solution with a pH 10.9 that has a few drops of alzarin yellow
a) How many moles of water form when 5.00L of propane gas completely reacts? b) How many grams of CO2 are produced from 18.5 g of oxygen gas and excess propane? c) How many grams of H2O can be produced from the reaction of 8.50*10^22 molecules of ..
A person ate 0.516 pound of cheese (an energy intake of 4130 kJ). Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to v..
question to isolate caffeine from tea dora forgot to evaporate methylene chloride 15 ml before adding the acetone and
Draw a potential energy diagram that represents the three step mechanism for the reaction and label the reactants and products for the overall reaction. Assume the overall reaction is endothermic
Calculate the pH of the 0.20 M NH/0.26 M NHCl buffer. What is the pH after the addition of 20.0 mL of 0.050 M NaOH to 90.0 mL of the buffer solution? The Kb of ammonia is 1.8 x 10-5.
If 3.8 kcal is released by combustion of each gram of glucose, how many kcal are released by the combustion of 1.5 mol of glucose
A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL (1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL
Identify the acid and base on the left side of following equations and identify their conjugate species on the right side. (Type your answer using the format (NH4)2CO3 for (NH4)2CO3, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-.)
Drag the flask and drop it on the lower half of the burette to connect them. Open the Data window and click on the flask. Click the Pushpin icon in the blue bar of the Data window to lock its display to the flask's contents.
The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?
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