Calculate the work in units of kj for the gas expansion
A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. Calculate the work in units of kJ for the gas expansion.
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Calculate the amount of heat (kcal) released when 50.0 g of steam at 100 degrees celsius hits the skin, condenses, and cools to a body temperature of 37 degrees celsius.
A 10.0 g piece of metal at 100 C is transferred to a calorimeter containing 50.0 mL of water initially at 23.0 C. Calculate the specific heat capacity of the metal if the heat capacity of the calorimeter, C cal, is 25.0 J/K. The final temperature,
A 1.553 g sample of chymotrypsin is placed into 100.0 mL of water. When this solution was separated from pure water by a semipermeable membrane, the resulting osmotic pressure supported a column of Hg that was 11.6 mm high.
When 2.0 g of aspirin was shaken up in a flask containing two immiscible liquids it was found that the mole fractions in the two liquids where 0.11 and 0.18.
At the beginning of a titration to standardize the NaOHsolution, Student A adjusted very carefully the initial burettevolume to 0.00 ml. But he did not notice an important air bubble atthe tip of the burette.
A 11.7 kg piece of metal at 94.9 C is placed in 481 g of water at 26.1 C in an insulated container. The metal and water come to the same temperature at 36.1 C.
A flask of water is connected to a vacuum pump. A fewmoments after the pump is turned on, the water begins to boil.Then, a few minutes later, the water begins to freeze. Explain what happened.
Fluorine-18 is a radioactive isotope used to image the brain. The half-life of Fluorine-18 is 1.83 hours and follows a first order decay. What is the rate constant for Fluorine-18?
MIlk of magnesia , Mg(OH)2, is prepared from aqueous solutions of magnesium sulfate and sodium hydroxide. If a solution containing 50.0-g of MgSO4 is added to a solution with 50.0-g of NaOH.
A dilute aqueous solution of an organic compound soluble in water is formed by dissolving 2.35 g of the compound in water toform 0.250 L solution.
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