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Calculate the empirical formula for a chemical compound which gives the following analysis: 12.6 percent lithium, 29.2 percent sulfur, and 58.2 percent oxygen.
Mixture also contains He (helium gas). determine the partial pressure of the He gas?
If the solution has the same density and specific heat as water, what is ?H for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes. Find kJ/mol of H20
The amino acid histidine has three pKa's at 1.8, 6.0 and 9.3. In a 0.01 M solution of histidine, what is the concentration of protonated carboxylic acid at pH 7.4? The primary amine? The side chain?
How many kJ of heat are required to produce 13.7g NO2, by 2NO2+ O2 --> 2NO2. the heat of reaction is 113.04
It takes 47.0 to raise the temperature of an 10.6 piece of unknown metal from 13.0 to 24.7. What is the specific heat for the metal?
A compound containing only carbon, hydrogen, and oxygen is subjected to elemental analysis. Upon complete combustion, a 0.9294-g sample of the compound
what is the freezing point of a benzene solution containing 400 g of benzene and 200 g acetone c3h6o? kf for benzene is
How much heat is needed to warm 250 g of water from 22 C to 98 C? The specific heat of water is 4.18 J/g . Be sure to include units but do not use scientific notation.
A compound composed of iron and carbon monoxide, Fe x (CO) y, is 30.70% iron. What is the empirical formula for the compound
A mixture consisting of 30ml of waste and 270ml of seeded dilution water has an initial DO of 8.55mg/l; after 5 day, it has a final DO of 2.40 mg/l. Another bottle containing just the seeded dilution water has an initial DO of 8.75 mg/l
two scientists are experimenting with pure samples of isotope x a highly radioactive substance. the first scientist has
Calculate the de Broglie wavelength, in nm, of a baseball of 5.25 ounces with a speed of 97.0 mph
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