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Canadian 10¢ and 25¢ coins are made of pure nickel which has a density of 8.902 g/cm3. Suppose each dime weighs 2.00 g and each quarter weighs 5.00 g. A small collection of dimes and quarters are submerged in 10.00 mL of water in a graduated cylinder causing the water level to rise to the 18.87 mL mark. What is the combined monetary value (in Can$) of those coins?
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
Sodium ions are found int eh extraellular fluid in a concentration of 150mM. How many grams per liter is this?
If Kp = 1.80 for this reaction, what is the total pressure inside the vessel at equilibrium?
What is the effective concentration between the ends if you consider the characteristic ratio of dna?
Suppose 50 mL of 0.020 M Hydhrochloric acid solution was mixed to 50 mL of 0.20 M acetic acid solution (Ka of acetic acid, CH3COOH, = 1.8 x 10-5). Determine the approximate pH of the mixture.
At 50 degrees Celsius and atmospheric pressure, water is in the liquid phase. What two things could be done to liquid water to change it to a vapor?
NO is produced in the atmosphere at moderately low partial pressure by high temperature combustion. What is its fate as cooling occurs? To help address the question, calculate the equilibrium constant at 298 K and 1300 K for each reaction
The volume of a gas sample is 650. mL at STP. What volume will the sample occupy at 25.0°C and 950. torr pressure.
A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places
What is the selenide ion concentration [Se2-] for a 0.100 M H2Se solution that has the stepwise dissociation constants of Ka1 = 1.3 x 10-4 and Ka2 = 1.0 x 10-11
In the titration of 68.0 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.49 M HCl, calculate the pH under the following conditions.
A solution is prepared with 3.85 grams of an unknown compound in 100.0 grams of cyclohexane. The solution had a freezing point of 4.18 degree celcius (277.33 kelvins). What is the molar mass of the unknown compound?
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