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How much heat energy would it take to heat 100 ml of waterfrom 60ºC to 90ºC? (You can easily answer thisquestion by simply comparing the amount of water and the amount oftemperature change
You have two perfectly insulated cups. One contains water and the other contains an equal volume of another liquid that has half the density of water and twice the specific heat capacity. You heat t
A 1.505 g sample of unknown was dissolved in 50 mL of benzene(density = 0.879 g/mL) Solution had melting point of 4.70 degree C.The freezing point of pure benzene is 5.53 degree C and the freezing p
A certain second order reaction required 60.2 seconds for the concentration to drop from 0.50 M to 0.36 M. How long will it take (in seconds) for the sample to go through three half-lives (starting
Most of the medications that we ingest are removed from our bodiesvia a first order process. It is the aim of the physician to keepthe concentration of medication (in our body) more or less constant
A chemistry student dissolved 500 grams of AlCl3 in 2750grams of H20. The resulting solution had a density of1.015 g/mL. What is the concentration of chloride ion in parts permillion (ppm)?
A 0.250 g quantity of an acid is titrated with 0.108 MNaOH. It takes 27.22 mL of NaOH to reach the end point. What is the equivalent weight of the acid?
Sylvanite is a mineral that contains 28.0% gold by mass. How much sylvanite would you need to dig up to obtain 70.0 g og gold?
The average rate of consumption of Br- is 1.85×10-4 over the first two minutes. What is the average rate of formation of Br2 during the same time interval?
A student collected hydrogen gas in a buret overwater at 230 C. The buret could not be submergeddeep enough in a water bath to equalize the pressure. The liquid level inside the buret was 14.2 cm ab
A zero-order reaction has a constant rate of 1.60*10-4M/s. if after 40.0s the concentration has dropped to1.00*10-2 M, what is the initial concentration?
Why is it that a solution of sodium dichromate in sulfuric acid is perfect to oxidize a secondary alcohol to a ketone...is it equally good a reagent for the oxidation of a primary alcohol to a aldeh
50.0 mL of water are placed in a calorimeter. When 15.0 g of ice are added to the calorimeter, the temperature drops from 70.0 C to51.2 C. Calculate the heat of fusion of ice in kJ/g, and inkJ/mol
What volume of dry hudrogen would be produced understandard conditions when 0.250 g of magnesium reacts withexcess HCL?
A large power plant under full load burns about 10000.0 tons of coal a day. How many new power plants would need to be built to meet a projected global energy demand equivalent to 100.0 MB of oil p
Why must the equipment for a Grignard reaction be very dry? In some reactions, simply rinsing with acetone prior to the reaction is satisfactory. Why might rinsing with acetone before starting the
How much specific heat must be added or removed(isobarically) to maintain the cabin at 25 degrees Celsius? Consider the air as dry air.
Gold forms a substitutional solid solution with silver. Calculate the number of gold atoms per cubic centimeter (in atoms/cm^3) for asilver-gold alloy that contains 18.9 wt% Au and 81.1 wt% Ag.
The quantity 432 mg of a monoamino monocarboxylic amino acid isobserved to consume 7.39 mEq of acid and base in the titrationrange pH 0.8 to 12.0. What is the name of the amino acid?
When a molecule must have a double bond inaccordance with the octet rule, what shape does it have accordingto VSEPR? Or if you can't answer that, does that double bond countas a lone electron pair,
Patients undergoing an upper GI tract lab test are typically givenan X-ray contrast agent that aids with the radiologic imaging ofthe anatomy. One such contrast agent is sodium diatrizoate (NaDTZ),a
Compound A has a solubility of 18 grams per 100. grams of water at25 degrees C. Cooling a saturated, 200.-gram solution of compound Afrom 84 degrees C to 25 degrees C results in a precipitation of 1
The concentration of commercially available concentrated nitric acid is 70.0 percent by mass, or 15.9 M. Calculate the mass of the water in kg in exactly 100g solution.
The boiling point of a solution of an electrolyte (122.30 grams;molar mass 196 g/mol) dissolved in water (218.2 grams) wasdetermined to be 102.33 deg C. What is the value for the van't Hofffactor i
How would you prepare 2.0 Liters of 0.20 M NaOH solution from50% (w/w) NaOH solution that has a density of 1.53 g/mL? All measurements must be by volume and not mass.