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A 280ml flask contains pure helium at a pressure of 754 torr . A second flask with a volume of 475ml contains pure argon at a pressure of 732 torr . If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium? What is the partial pressure of argon?
A 4.60 g nugget of pure gold absorbed 288 J of heat. What was the final temperature of the gold if the initial temperature was 26.0°C? The specific heat of gold is 0.129 J/(g·°C).
How many kilograms of sodium fluoride would be needed to treat a 8.00 x 10^7 gal reservoir
Consider a solution formed by mixing 51.0 mL of 0.100 M H2SO4, 27.0 mL of 0.100 M HOCl, 25.0 mL of 0.200 M NaOH, 25.0 mL of 0.100 M Ca(OH)2, and 10.0 mL of 0.150 M KOH. Calculate the pH of this solution.
A 125g metal block at a temperature of 93.2 degrees Celsius was immersed in 100g of water at 18.3 degrees celsius. Given the specific heat of metal (s= 0.900j/g x degrees celsius)
What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 12.7 L of water to produce an antifreeze solution with a freezing point of -34.6°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)
Free radicals are also important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the action of sunlight on air pollutants, is formed in part by the following two steps.
how many grams of ammonium nirtate must have reacted if 3.75dm3 of nitrogen gas was collected over water at 26C and 97.8 kPa
which of the following shows the acids in order from strongest to weakest? The order of atomic radii is I > Br > Cl
P4(s) + F2(g) PF3(g) What mass of F2 is needed to produce 151 g of PF3 if the reaction has a 79.3% yield?
Protons can be accelerated to speeds near that of light in particle accelerators. Estimate the wavelength (in nm) of such a proton moving at 2.90 X 108 m/s. (Mass of a proton=1.673 X 10-27 kg)
A 120g sample of an unknown substance was heated from 15oC to 30oC. The substance absorbed 458 joules of energy. What is the specific heat of this substance?
At a temperature of 395*C and a pressure of 705 mmHg, how many grams of NH3 can be produced when 3.80 L of NO2 react?
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