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A sample of an unknown gas effuses in 12.8 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.11 min. What is the molar mass of the unknown gas?
A system absorbs 295 kJ of heat and the surroundings do 177 kJ of work on the system. What is the change in internal energy of the system?
Calculate the concentrations of ALL species in a 0.740 M Na2SO3 solution. The ionization constants for sulfurous acid are Ka1
volume of a piece of galena is 4.7 cm3. determine the mass of that piece of galena if the density of galena is 7.5 gcm3
For the reaction shown, compute the theoretical yield of the product (in moles) for each of the following initial amounts of reactants. 2mn(s) = 2O2(g) --> 2MnO2(s) a) 3 mol Mn, 3 mol O2 b) .235g Al, 1.15g Cl2
density of gold is 19.31 gcm3density of platinum is 21.43 gcm3if equal masses of gold and platinum are transferred to
It takes 51.0 J to raise the temperature of an 11.0 g piece of unknown metal from 13.0 degrees celcius to 24.0degrees celcius What is the specific heat for the metal? Express your answer numerically, in Joules/gram Degrees celcius
What is the pH of a solution in which 323 mL of HCl(g), measured at 26.8 degrees Celsius and 1.02 atm, is dissolved in 1.5 L of aqueous solution?
Descibe at least four possible factors which may influence the amount of light absorbed by a solution and how these factors may affect the absorption
Acetic acid, CH3COOH, could be produced from (a) the reaction of methanol with carbon monoxide; (b) the oxidation of ethanol; (c) the reaction of carbon monoxide with methane. write balanced chemical equations for each process. carry out a thermod..
Some HN3 would be used up in re-establishing equilibrium Some HNO2 would be formed in re-establishing equilibrium Some HNO2 would be formed, and some N2H4 would be lost More HN3 and H2O would be formed The temperature would decrease, and the forwa..
1. what characteristic properties distinguish the transition elements from the group ia and-iia metals?2. name these
What mass (in g) of iron is needed to evolve 730.5 kJ of heat under standard conditions as it forms iron(III) oxide
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