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Calculate the final temperature when a 25.5 gram sample of ice at 0oC is placed into a styrofoam cup containing 116 grams of water at 71.9 oC.
Why do we assume that the extra electrons in I3- must be placed on the central Iodine atom to exceed the octet rule? Is there any reasoning/theory that discourages the electrons being placed on the no
If 12.6 grams of iron (III) oxide reacts with 9.65 grams of carbon monoxide to produce 7.23 g of pure iron, what are the theoretical yield and percent yield of this reaction? Be sure to show the wor
How many grams of dry NH4Cl need to be added to 2.40 L of a 0.400 M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.58? Kb for ammonia is 1.8*10 ^-5.
65.50 mL of 0.161 M HF is titrated with 0.1200 M NaOH. How many mL of the base are required to reach the equivalence point? (Ka for HF is 6.8 x 10-4)
Calculate the amount of heat (kcal) released when 50.0g of steam at 100 degrees celcius hits the skin, condenses, and coos to a body temperature of 37 degrees celcius.
what are the partial pressure in atm of each components of this mixture if it is held in a 10.0 L vessel at 14 degree Celsius.
Write a balanced equation for the reaction and determine how much oxygen in grams to the nearest 0.1 grams is formed by the complete reaction of 148.4 g of NA2o2.
65.50 mL of 0.161 M HF is titrated with 0.1200 M NaOH. What is the pH at the equivalence point? (Ka for HF is 6.8 x 10-4)
At 710. mm Hg, a sample of nitrogen gas occupies 625 mL. What volume does the gas occupy if the temperature remains constant and the pressure increases to 760. mm Hg?\
a 2.00 g peanut is burned in a bomb calorimeter containing 1400 g of water. the temperature of the water increases from 25 C to 30.25 C. What is the heat change, in Calories, for this peanut?
A bicycle tire is filled with air to a pressure of 100 psi at a temperature of 100 degrees C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees C. the volum
65.50 mL of 0.161 M HF is titrated with 0.1200 M NaOH. What is the pH after 65.50 mL of base have been added? (Ka for HF is 6.8 x 10-4)
The normal freezing point of mercury is -38.9 C and its molar enthalpy of fusion = 2.29/kj/mol. What is the entropy change of the system when 50g of mercury freezes at the normal freezing point?
A gas mixture with a total pressure of 765 g contains each of the following gases at the indicated partial pressures: CO2, 116 mmHg ;A , 211 mmHg ; and O2 , 184 mmHg . The mixture also contains heli
A sample of gas occupies a volume of 445 mL at a temperature of 274 K. At what temperature will this sample of gas occupy a volume of 499 mL? Show all of the work used to solve this problem.
what is the calcuated free space (as %) for each of these materials? why will need to estimate the volume of water as the sum of 2H atoms and 1 oxygen atoms with radii of 37 and 66 pm respectively.
286 mL of 0.500 M Na2SO4 solution and 168 mL of 0.300 M Al2(SO4)3 solution were mixed together. Calculate the concentration of SO42- ions in the final solution?
After hours of counting, they turn in their total as 0.032 miles of balls. Show the steps the manager would follow to determine how many balls there are?
Calculate the heat of reaction for the same reaction where water is a gaseous product instead of a liquid.
How many of joules of heat are needed to raise the temperature of 10.0g of aluminum from 22 degrees C, if the specific heat of aluminum is 0.90 j/g degrees c.
How many moles of NO2 gas can be produced from 45.5 g of O2 gas in the following reaction? (show your work in the answer box - limit 100 caracters).
What is the half-life of a compound if 89 percent of a given sample of the compound decomposes in 56 min? Assume first-order kinetics.
Write a short paragraph that describes how electrons fit into these higher levels and that explains why a space must be left in the lower periods on the periodic table.