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A compound contains only C, H, N, and O. A 1.279g sample was burned to give 1.60 CO2 and .77g H2O. A separately weighed 1.625g sample contained 0.216g N. What is the empirical formula of this compound?
how many grams of sodium lactate should be added to 1.00 of 0.150 lactic acid to form a buffer solution with 4.00?
What is the pressure inside a 5.00 L vessel containing 0.0040 mol of nitrogen gas at a temperature of 23 degrees C
Sulfur, S8, combines with oxygen at elevated temperatures to form sulfur dioxide. If 192 oxygen molecules are used up in this reaction, how many sulfur molecules reacted
A mineral has a face centered cubic arrangement of its atoms and an edge of the unit cell is 565.685 pm. the density of this mineral is 11.008 g/mL. Determine the radius of an atom, the packing efficiency, and molar mass.
There is substance that needs to be heated. the substance is gas. If were given T and P of the inlet and outlet, and given two equaitons one a z equation, for example:
The energy required for the ionization of a certain atom is 3.44 x 10-18 J. The absorption of a photon of unknown wavelength ionizes the atom and ejects an electron with velocity 1.03 x 108 m/s. Calculate the wavelength of the incident of radiatio..
Draw the skeletal structure of the enantiomer(s) of (2S,4S)-(+)-rose oxide. (Draw all enantiomers if more than one exists.) Draw the skeletal structure of the diastereomer(s) of (2S,4S)-(+)-rose oxide. (Draw all diastereomers if more than one exists..
When 150g of water at a temperature of 22.5C is mixed with 65.5g of water of an unknown temperature. The final temperature of the resulting mixture is 47.9C. What is the initial temperature of the second sample
What is the pH of a buffer that results when 0.50 mole of Na3PO4 is mixed with 0.75 mole of HCl and diluted with water to 1.00 L? The acid dissociation constants for phosphoric acid
find delta H for the solution of 1g NaOH in water d) find delta H for the solution of 1 mole NaOH in water e) Given the following heats of formation
Calculate the work (in kJ) when 2.20 moles of methane react with excess oxygen at 384 K: CH4(g) + 2O2(g) ? CO2(g) + 2H2O(l) Hint
Use average bond energies to estimate enthalpy changes for C(s) + CO2(g) -----> 2CO(g) i got -221 kj/mol, but it was the wrong answer though.
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