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Three portions of the same liquid are mixed in a container that prevents the exchange of heat with the environment. Portion A has a mass m and a temperature of 99.0°C, portion B also has a mass m but a temperature of 78.6°C, and portion C has a mass mC and a temperature of 36.0°C. What must be the mass of portion C so that the final temperature Tf of the three-portion mixture is Tf = 46.0°C? Express your answer in terms of m.
In the reaction of aluminum metal and oxygen gas to make aluminum oxide, how many moles of aluminum will react with 0.80 grams O2?
Calculate the heat needed at 0 degrees Celsius in each of the following and indicate whether heat is absorbed or released: a) joules to freeze 35.2 g of water; b) joules to freeze 275 g of water; c) kilojoules to melt 145 g of ice; d) kilojoules t..
Symthesis of methyl salicylate from salicylic acid, methanol and H2SO4 as a catalyst. Methanol is already in excess I need to know how else one can improve the % yield of the methyl salicylate
What is the pH of a buffer that is 0.50 M NH3 (pKb = 4.75) and 0.20 M NH4Cl after 50 mL of 0.2 M HCl is added to the 1 L solution
Rationalize this phenomenom based on what you know regarding cyclohexane derivatives and Sn2 reactions.
how does the technique error affect the report percent water in the hydrated salt? Explain lab 5 percent water in a hydrated salt.
A galvanic cell has an iron electrode in contact with 0.11 M FeSO4 and a copper electrode in contact with a CuSO4 solution.
What salt is produced in each of the following neutralization reactions?
what is the most likely reason osha requires employers to protect flooring and handling areas in buildings against
ichromate solution is 0.0189 M dichromate, and it took 26.01 mL of your standard iron solution to titrate the excess dichromate in an unknown. What is the chemical oxygen demand of the sample, in units of mg O2/L?
describe in detail reagent solvent you can employ to prepare OTTO DIELS and KURT ALDER reaction. Note that this reaction involves the 1-4- addition of a conjugated diene in S-cis, S-trans conformation to an alkene in which two new sigma bond are f..
What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate, Ca(NO3)2, in 250 mL of water? (The molar mass of Ca(NO3)2 is 164 g/mol.)
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