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A pure gold ring, weighs 27.8 g, is heated to 123 C and then tossed into a coffee cup calorimeter contain 50.00 mL of pure water at 23.1 C. assuming no heat transferred between the cup and the surroundings, what is the temperature of the water after teh ring and water reach thermal equilibrium
An analysis of nicotine (MW=162 g/mol) gives 74.0% carbon, 8.65% hydrogen, and 17.3 nitrogen. What is the true Molecular formula for nicotine?
How many moles of NaOH must be added to 1.0 L of 1.2 M HC2H3O2 to produce a solution buffered at each pH. a) pH=3.87 b) pH=5.24
acetaminophen the generic name for tylenoltm consists of carbon hydrogen nitrogen and oxygen atoms. a student in an
Express you answer as a chemical equation. Identify all of the phases in your answer.
A certain constant-pressure reaction is nonspontaneous at 45oC. The entropy change for the reaction is +72 J/K. What can you conclude about the sign and magnitude of the enthalpy
in the titration of 50.0 ml of 1.0 m methylamine ch3nh2 kb 4.4 10-4 with 0.50 m hcl calculate the ph under the
which one of the following represents the best method for the preparation of 3-chloro-3 ethylpentane?
If 10.0 L of carbon dioxide gas at STP and 50.0g of sodium chloride react with excess ammonia and water, what is the limiting reactant and the mass of baking soda produced
sulfur is used in the production of vulcanized rubber detergents dyes pharmaceuticals insecticides and many other
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
A 12.0 gas cylinder has been filled with 5.40 moles of gas. You measure the pressure to be 5.00 atm. What is the temperature inside the tank? Express your answer numerically in degrees Celsius.
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 150.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
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