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How many kilogram of methane gas must bedischarged in a room of 306 cubic meters to reach the lower explosive limit of 5 volume percent?
In a simplified and example version of the solar system model (developed by Neils Bohr, a Danish chemist), an electron in the first orbit has an energy of 2 J
If 12.0 g naphthalene (C10H8) is dissolved in 119.4 g chloroform, what is the molality of the solution
The concentrations of each were then determined as follows: [Fe^3+]= 6.8 x 10 ^-4 M, [SCN ^-]= 3.3 x 10 ^-4 M, [FeSCN ^2+]= 3.0 X 10 ^-5 M. Determine the equilibrium constant for this reaction.
natural uranium consists almost entirely of 238u. to operate a nuclear power reactor the fuel must be enriched in a
A monoatomic ion X- has 29 electrons and 34 neutrons. What is the identity of element X? How do you begin to solve this?
A 150 g sample of water (initially at 45.0oC)is mixed with a 200 g sample of water (initially at 84.0oC). Find the final temperature of the system
You have 250.0 ml . graduated cylinder containing some water(61.0 ml). Theb you drop three marbles with a total mass of 95.2 g into the water (final volume is 95.5 ml). What is the average density of a marble
A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 31 degrees C and 1.00 atm?
A stock solution was prepared by dissolving exactly 0.4000 g of pure ASA (180.16 g/mol) in 10.00 mL of NaOH and heating the solution to a gentle boil.
density generally increase decrease or remain unchanged when items are heated,Briefly explain your answer?
If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a 0.10 M solution of the conjugate and why
Which set of atoms is correctly arranged in order of increasing electronegativity (lowest electronegative atom listed first)
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