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Calculate the pH of a buffer made with 0.50M phosphoric acid and 0.75M sodium dihydrogen phosphate. Ka = 7.5 x 10^-3
Once the liquid nitrogen is evaporated, in time, the balloon re-inflates. Use kinetic theory to explain this sequence of events. The temperature of liquid nitrogen is -196 degrees celsius.
Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
A total of 2.00 rm mol of a compound is allowed to react in a foam coffee cup that contains 117 g of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7 ^circ rm C. Wha
A 385-L sample of this gas, measured at 22.6 °C and 739 mmHg, is burned at constant pressure in an excess of oxygen gas. How much heat, in kilojoules, is evolved in the combustion reaction?
20 sample of dry ice is added to a 765 flask containing nitrogen gas at a temperature of 25.0 and a pressure of 715 . The dry ice is allowed to sublime (convert from solid to gas) and the mixture i
The rate constant for a certain reaction is = 5.80×10-3 . If the initial reactant concentration was 0.350 , what will the concentration be after 2.00 minutes?
A 2.00 l sample of h2 at 70c and 725mmhg is compressed to 1750ml at 1.20atm what is the new temp? Calculate the c temperature at which 43.0g of oxygen occupies 1300. ml at 860 torr
What is the freezing point of a benzene solution containing 400 g of benzene and 200 g acetone (C3H6O)? Kf for benzene is -5.12 C/m. The freezing point of pure benzene is 5.5 degrees Celcius.
Ammonia (NH3, Kb = 1.8 x 10^-5) is added to 100 mL of water at room temperature. The vapor pressure of the water above the solution drops to 0.03 atm. What is the pH of the solution in the limit th
If the height of the mercury column in the leveling bulb is 30 mm greater than that in the gas buret and atmospheric pressure is 670 mm, what is the pressure on the gas trapped in the buret?
A 184-mg sample of Na2CO3 is dissolved in H2O to give 3.00L of solution. What is the concentration of Na+ in parts per million (ppm)?
The number of moles in .452 grams of NaClO4, the number and type of particle in .452 grams of NaClO4, is it possible for NaClO4 to be soluble in water.
Ferrophosphorus (Fe2P) reacts with pyrite (FeS2) producing iron(II) sulfide and a compound that is 27.67% P and 72.13% S by mass and has a molar mass of 444.56g/mol. Write a balanced chemical equati
A copper refinery produces a copper ingot weighing 75 kg. the density of the copper is 8.94 g/cm^3. if the copper is drawn into a wire whose dimeter is 8.250mm,how many feet of copper can obtained f
It the acetylene was collected over water at 17 Celcius and .974 atm, how many milliliters of acetylene were produced.
Determine the number of moles of O2 produced by the decomposition of 639 g of NaClO3.
Which pair would be least diffcult to separate by fractional precipitation?
Consider a sample that is a mixture composed of biphenyl, benzoic acid, benzyl alcohol. Predict the relative Rf values for the three components in the .
one hundred grams of water is saturated with NH4CLat 50 degrees C. According to table G, if the temperature is lowered to 10 degrees , what is the total amount of NH4CL that will precipitate?
If an iron scoopula, instead of a plastic one, is used to add unknown metal to HCl solution, will it affect the calculated molar mass of the unknown metal?
How many grams of ethylene glycol (automobile antifreeze, {rm C_2H_6O_2}) dissolved in 3.30 {rm kg} of water is needed to lower the freezing point of water in an automobile radiator to 24.5^circ {rm
How does [HCl] Affect the Change in Temperature at Constant Volume in NaOH Solution? What kind of relationship? Linear or power or exponential etc.
A 4.80 g nugget of pure gold absorbed 298 J of heat. What was the final temperature of the gold if the initial temperature was 24.0°C? The specific heat of gold is 0.129 J/(g·°C).
A 2.40-g sample of a large biomolecule was dissolved in 12.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec