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Calculate the change in total internal energy for a system that releases 2.15×104kJ of heat and does 6.04×104kJ of work on the surroundings. Enter your answer in scientific notation.
Δ U=× 10kJ
Amphetamines in urine can be confirmed by mass spectroscopy at a concentration of 500 ng/mL. Assuming a urine density of 1.025 g/mL, what is this concentration in parts per million
450 mL of oxygen is bubbled through water at 10 degrees celsius and exerts 720.0 torr. What volume will the dry gas occupy at 730.0 torr and 10 degrees celcius?
A 1.00 mole sample of He is placed in an empty vessel to make a pressure of .500 atm. A 48.0g quantity of methane, CH4, is added to the vessel. Explain what is the mole fraction of the methane in the vessel
Write the name and formula of 10 substances that you would not be appreciably soluble in water.
A sample of CO in a cylinder with a moveable piston has a 5320 torr pressure at a temperature of 124 °C when the volume is 4800 mL.
The combustion of 135mg of a hydrocarbon produces 440mg of CO2 and 135mg of of H2O. The molar mass of the hydrocarbon is 270 g/mol. Determine the molecular formula of this compound ?
A flask of one litre is filled with 1.30 grams of argon gas at the temperature of 25 degrees Celsius. A sample of ethane (C2H6) vapor is combined to this flask until the total pressure becomes 1.10atm now determine the partial pressure of Ar Gas ..
Whats the cell potential when the Cu2+ conc. has fallen to .220M. What are the conc. of Pb2+ and Cu2+ when the cell potential falls to .350V
Commercial concentrated nitric acid is 69.0 % by mass HNO3 and has a density of 1.42 g/mL. Calculate the molarity of concentrated nitric acid.
determine the equilibrium ph of aqueous solutions of the following strong acids or bases: a)15mg/l of hso4- b)10 mM NaOH c)2500 mg/l of HNO3.
A1.15 g sample of dry ice is added to a 765 mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 715 mm Hg.
1.what key metabolic substance is formed directly from catabolism of all three major classes of foods carbohydrates
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