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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.)
In the equation HSO4- + H2O SO4-2 + H3O+, if the Ka is 1.5 x 10 ^-2 and HSO4- = 1.0 M at equilibrium, what is the pH of this solution?
What is the pH at the half-stoichiometric point (that is, what is the pH when you have added 50% of the total volume of base required to react with all of the acid originally present?)
If 4.50 g of methane gas (CH4) is in a 2.00-L container at 35°C, what is the pressure in the container?
An underground reservoir contains natural gas at a pressure of 425 kPa and a temperature of 15 °C. If the volume of the reservoir is 1.3 x 104 kL
Tincture of iodine is I2 dissolved in ethanol, C2H5OH. A 1% solution of tincture of iodine is 10.0g of solute for 1000. g of solution. How many grams of solvent are present in 1000. g of this solution? How many moles of solute are in 10.0g of I2? ..
What volume of water should be added to 600 mL of ethanol in order to have a solution that boils at 95 degrees Celsius? (For ethanol, Tb=78.4 degrees Celsius, Kb=1.22 degrees Celsius and d= 0.789 g/ml. For water d= 1.00 g/m
Consider the addition of 22.59 mL of 0.1643 M aqueous HCl to 19.01 mL of 0.1558 M aqueous NaOH at 25°C. Assuming the volumes are additive, what is pOH of the resulting solution?
Concrete used in road construction is reinforced using steel bars in a grid, known collectively as "rebar." After many years, rebar will begin to corrode, and the concrete will weaken.
A backpacker wants to carry enough fuel to heat 2.2 kg of water from 30 C degree to 100.0 C degree. If the fuel he carries produces 36 kJ of heat per gram when it burns
A 0.277 g sample of unknown monoprotic acid requires 39.21 mL of 0.1019 M NaOH to reach the endpoint.
Make a list of the operations you will need to perform in order to display a spectrum of your food dye on the spectrophotometer.
As of 2007 world record for swimming 1500.0 m in a long course pool is 14 min 34.56 s. if we follow this rate then calculate how many seconds would be taken by a man to swim 0.850 miles?
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