Partial pressures of helium and argon
A 295- flask contains pure helium at a pressure of 757 . A second flask with a volume of 460 contains pure argon at a pressure of 713. What are the partial pressures of helium and argon? What is the total pressure?
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A balloon contains 0.140 g of helium at a pressure of 1.00 atm. At what temperature will the balloon have a diameter of 12.8 centimeters. Assume the balloon takes the shape of a sphere. Give your answer in degrees celcius.
A steel tank containing helium is heated to 555?C. If you could look into the tank and see the gas molecules, what would you observe?
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How many moles of excess reagent (calcium hydroxide) are left over? Calculate how many moles of calcium hydroxide could be converted by the HCl available, then subtract from your answer to part b.
Boron has two naturally occuring isotopes,, 10B (19.9%) and 11B(80.1. althought the b2 molecule doesn not exist naturally on earth, it been been produced in the laboratory and been observed in stars.(A) how many molecules are possible? (b) what ar
5.0 gram sample of KBr at 25 degrees Celsius dissolves in 25 mL of water also at 25 degrees Celsius. The final equilibrium temperature of the resulting solution is 18.1 Celsius. What is the enthalpy of solution delta-heat of KB4 expressed in kilo
Write the net ionic equations for the precipitation reaction or reactions that occur. What are the spectator ions in the solution?
The pollutant has a reaction rate coefficient K of 0.25/day. Assuming the pollutant is well mixed in the lake, find the steady-state concentration of pollutant in the lake.
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