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A cylinder contains 250 g of Helium at 200 K. The external pressure is constant at 1 atm. There is an increase in temperature of 56 K. Calculate the heat lost or gained by the system in response to this change in the external temperature. Express your answer in J. Heat capacity for Helium = 20.8 J/(mol K) Molecular weight for Helium = 4 g/mol
Calculate the pH of the 0.39M NH3/ 0.73M NH4CL buffer system . B) what is the pH after the addition of 20.0 mL of 0.075M NaOH
Discuss the symmetry of cyclohexane chair conformation, half chair conformation, and boat conformation.
A 47.0 mL sample of gas in a cylinder is warmed from 28 degrees Celsius to 91 degrees Celsius. What is the final temperature?
How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100 worth of gold.
What is the theoretical yield of aspirin in an experiment if you start with 2.0 g of salicylic acid and 5.0 mL of acetic anhydride (density = 1.08 g/mL)
Suggest a mechanism for the hydrolysis of n-butyl bromide to n-butanol. Include the elementary steps and indicate the rate determing step
Calculate the quantity of heat in calories release when 241.62 g of water is cooled from 80.6°C to 28.0°C.
Taking into account resonance, which of the following has/have the weakest C-O bond
in the barium chloride laboratory activity what change occurred in the physical appearance of the barium chloride
traditionally foreign direct investments fdi has followed foreign trade since foreign trade is typically less costly
What is the composition in mole fractions of a solution that has a vapor pressure of 30. torr at 20°C? X C6H6 and X C7H8. What is the mole fraction of benzene in the vapor above the solution described in part (a)?
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa).
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