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The triangleHfus of ethanol (C2H5OH) is 4.60KJ/mol. How many kilojoules are required to melt 24.5grams of ethanol at its freezing point?
How many possibilities are there to assort the billiard balls in a line (include the (white) cue ball)? How many possibilities are there to arrange 6 red and 6 yellow balls in a line?
How much energy is required to turn 9 g ice at 249 K into steam at 426 K? Specific heat of ice = 2.077 J/g·K. Specific heat of water = 4.180 J/g·K.
What is the relative concentrations of Hln(yellow) and Ln-(blue) for bromophnol blue (Ka=1.0X10^-4) at pH of 2
The ball slows down to 3.5 m/s and then collides straight-on with a second billiard ball of equal mass. The first billiard ball completely stops and the second one rolls away with a velocity of 3.5
At high temperature, and in the presence of a catalyst. The equation is N2(g)+3H2(g)---->2NH3(g). If 4.0mol of H2 react, how many moles of NH3 will be produced.
Calculate the molarity of a solution of glycerol made by dissolving 68.000 glycerol at 15 in enough water to make 240.00 of solution.
When using a medicine dropper or a meat baster, you squeeze the rubber bulb and insert the end of the tube into a liquid. Why does the liquid rise inside the dropper or baster when you release the
He weighs 44lb, and the daily dose of amoxicillin for the treatment of the ear infection is 30mg/kg per day in divided doses every 12 hours. Determine the patient's body temperature in Fahrenheit.
A 260- flask contains pure helium at a pressure of 743 . A second flask with a volume of 470 contains pure argon at a pressure of 731 . If the two flasks are connected through a stopcock and the st
The calorimeter constant is 45.0kJ/K. when 34.0g of NH3 are reacted in the calorimeter, the temp rises by 10 degrees C. What is the change in energy, delta E, for the rxn?
Provide proper IUPAC names. Draw structure of strongest acid in the table provided. Give Products. Show relevant stereochemistry.
55 gallon drum weighs 75.0 lb. when empty. What will it weigh when it is filled with ethanol, which has a density of 0.789 g/mL? (1 gal=3.78L, 1 lb.= 454g)
Two liquids form a solution and release a quantity of heat. How does the pressure above the solution compare to that predicted by Raoult's law? Show all works.
An electric power station annually burns 3.3 107 kg of coal containing 1.4 percent sulfur by mass. Calculate the volume of SO2 emitted at STP
Its Dutch supplier sends the fabric in bolts of exactly 200 m2. What is the maximum number of chairs that can be upholstered by 3 bolts of fabric (1 m = 3.281 ft)?
If 18.6 of 0.800 solution are needed to neutralize 5.00 of a household ammonia solution, what is the molar concentration of the ammonia?
Discuss at least three potentially hazardous features associated with concentrated sulfuric acid.
A volume of 18.0 L contains a mixture of 0.250 mols N2 , 0.250 mols O2 , and an unknown quantity of He. The temperature of the mixture is 0 degrees C , and the total pressure is 1.00 atm. How many g
The specific heat of fat is 0.45 , and the density of fat is 0.94 . How much energy (in calories) is needed to heat 19 of fat from room temperature (25 ) to its melting point (35 )?
Tincture of iodine is I2(s) dissolved in ethanol, C2H2OH. A 1% solution of tincture of iodine is 10.0g of solute for 1000g of solution. How many grams of solvent are present in 1000g of this solutio
Based on the law of multiple proportions, how many grams of hydrogen would you expect 2.49 of nitrogen to combine with to yield ammonia?To yield hydrazine?