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(a) 1.381×10-4 mol of an unidentified gaseous substance effuses through a tiny hole in 89.2 s.
Under identical conditions, 1.710×10-4 mol of argon gas takes 82.2 s to effuse.
What is the molar mass of the unidentified substance (in g/mol)?
(b) The percentage C by mass in the above unidentified substance is 83.2%. It may also contain H and/or O, but no other element.
What is the molecular formula of the substance?
(In typing this formula use the convention of C first, H second and O last. For example, C6H8O2 would be C6H8O2.)
(c) Under identical conditions, how many moles of cyclopropane (C3H6) gas would effuse in 93.6 s?
Formic acid (Ka= 1.7 x 10^-4) and sodium formate were used to prepare a buffer solution of pH 4.31. The concentration of the undissociated formic acid in this buffer solution was 0.80 mol/L
A mixture of gases contains 0.290 mol CH4, 0.250 mol C2H6, and 0.270 mol C3H8. The total pressure is 1.60 atm. Calculate the partial pressure of the gases.
Show the overall reaction of racemic 3-bromohexane from (E)-3-hexene by entering the structures of the products and reactants in the template provided. (E)-3-hexene (S)-3-bromohexane (R)-3-bromohexane
How many moles of H3O+ must be added to 482 mL of a solution to adjust the pH from 8.80 to 5.56? Use E notation and 3 significant figures.
a) decreasing the volume of a gas b) melting a solid c) chemical reactions that increase the number of moles of gas d) forming mixtures from pure substances e)increasing the temperature of a gas
Evaluate the average kinetic and potential energies, and , for the ground state (n=0) of the harmonic oscillator by carrying out the appropriate integration.
an ideal gas is expand at a constant temperature with the pressure changing from 10 bar to 1 bar. assume Cp,m = 5/2R calculate delta U, delta H, delta S
Part A - What volume of 2.25M HCl in liters is needed to react completely (with nothing left over) with 0.250L of 0.300M Na2CO3. Express your answer numerically in liters.
One of the nobles gase of group was isolated in 1894 by allowing a large volume of air to react with magnesium so that the only noble gas, contaiminated with tracs of other noble gases,
Consider an ordinary 8 fluid oz. glass of water (H2O). Suppose, hypothetically, that all of the water molecules in the glass could be marked.
Calculate the molarity of the final solution with uncertainty. All the glassware used was Class A. The tolerances of Class A glassware can be found.
What are the subscripts in the empirical formula of this compound?
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