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The density of helium is .01784g/l at S.T.P. I a given mass of helium at S.T.P is allowed to expand to 1.500 times its inital volume bu changing the temperature and pressure, compute its resultant density
Explain why the rates of diffusion of nitrogen gas and carbon monoxide are almost identical at the same temperature.
Determining System Equilibrium, A one-litre cylinder at 458'C is found to contain 0.36 moles of HI (g), 0.15 moles of I 2(g), and 0.18 moles of H2(g). Is this system at equilibrium?
The decay constant for strontium-90 = 0.0247y-1. if 10.0 g decay for exactly 60 years then determine how many grams of strontium-90 remain.
Ammonia, NH3, can be synthesized by the following reaction: 2 NO (g) + 5 H2(g) -> 2 NH3(g) + 2 H2O(g) Starting with 86.3 g NO and 25.6 g H2, find the theoretical yield of ammonia in grams
an unknown gas sample is collected in a 255 ml countainer at 25c and 755 mm hg. how many moles of gas are present?
PH And Percent Ionization, 1. Determine the pH and the percent ionization in a 0.50M solution of KOBr. The Ka for HOBr = 2.5 x 10 ^ -9.
What is the the molar composition of the products when a stream of CH4 is combusted with 5% excess air if you have 1600 moles per hour of methane being fed into the reactor
30.0 mL of pure water at 280. K is mixed with 50.0 mL of pure water at 348 K. What is the final temperature of the mixture? Ignore significant figures for this problem.
Which of these statements correctly describes a diamond?
The mass of an electron is 9.11 times 10^{-31}kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31times 10^{-10} how fast is the electron moving relative to the speed of light? The speed of light is 3.0 times10^8 m/s.
Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel.
How much heat is evolved when 3ll.5g of ammonia (NH3) gas condenses to a liquid at its boiling point? ^Hvap= 23.3 kj/mol.
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