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1a)A 0.003525-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 24.5oC to 26.7oC. If the heat capacity of the calorimeter is 4.46 kJ (oC)-1, then what is the constant volume heat of combustion of this compound, in kilojoules per mole? (Remember to include a "+" or "-" sign in your answer, as appropriate.)
Enter your answer with 3 significant figures.
1b)Brass has a density of 8.40 g/cm3 and a specific heat of 0.385 J g-1 oC-1. A 11.2 cm3 piece of brass at an initial temperature of 154oC is dropped into an insulated container with 138.4 grams of water initially at 24.1oC. What will be the final temperature of the brass-water mixture? (The specific heat of water is 4.184 J g-1 oC-1.)
Enter your answer with 3 significant figures. Enter only numbers in your answer. (Do not include units.)
What is the rate constant of a first-order reaction that takes 343 seconds for the reactant concentration to drop to half of its initial value?
What would you expect to happen if you combined 10.0mL of 10^-2 M acetic acid and 5.0mL of 10^-2 M sodium hydroxide? What would be the concentrations of acetic acid and sodium acetate in this solution
One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell,
1.5000 g of diprotic weak acid H2A was dissolved in 100.00 mL volumetric flask. 25.00 mL aliquots of this solution was titrated with a monoprotic strong base NaH (0.0800 M). The titre volume of NaOH was 40.00 mL. Calculate the molecular weight of ..
When the following equation is balanced using the smallest possible integers, what is the exponent of N2O in the reaction quotient expression?
If doing by hand, please write dark onpaper before scanning. Balance and do total net ionic equations
What volume and mass of steam at 100.°C and 1.00 atm would, during condensation, release the same amount of heat as 100. cm3 of liquid water during freezing.
Assume that an air conditioner consumes 1.50 X 103 W of electrical power, and that it can be idealized as a reversible Carnot refrigerator. If the coefficient of performance of this device is 2.50, how much heat can be extracted from the house in ..
Elemental analysis of the solid suggested the composition C9H10O3. The solid melted at 117 °C and gave the following nmr spectra and the ir spectrum. What is this material and why and how did it come to be in both of these sources?
A sunscreen preparation with a density of 2.82 g/mL contains 3.55% by mass zinc(II) oxide. Each tube is filled with 185.0 mL of sunscreen. If you are the manufacturer and use 5.00 lb of zinc(II) oxide.
There are two carboxylic acid functions in 3-nitrophthalic acid. The pKa of the acid function is at the 2-position is approximately 2, whereas that at the 1- position is about 3. Which of the two is the more acidic and why
what is the K value for compound Z in this biphasic system, (2) how much do you remove in each individual extraction, (3) how much of compound Z is extracted with those three 33.3 mL extractions added together, AND (4) how much is still in the wat..
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