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A gas mixture contains helium and oxygen at respective partial pressures of 255 torr and 0.450 atm. What is the total pressure in mm Hg of the mixture?
Is a 0.15M solution of potassium benzoate C6H5COO-K+ acidic, basic, or neutral? Calculate the pH. The Kb for benzoic acid is 1.5 X 10^-10.
If equal masses of H2 and O2 (100.0 grams each) are reacted together to produce water, how many grams of water could be produced.
Will a precipitate of magnesium fluoride form when 300. mL of 1.1 × 10^-3 M MgCl2 are added to 500. mL of 1.2 × 10^-3 M NaF? [Ksp (MgF2) = 6.9 × 10^-9]
The formulas for ethane, ethene and ethyne are C2H6, C2H4, and C2H2 respectively. Rank these compounds by the length of the carbon-carbon bond.
The atmospheric activity of 14 C is 15 cpm/gC (counts per minute per gram of carbon). Assume that the cloth was made in the year 24 B.C. The half-life of 14 C is 5730 years. What will be the expected activity of 14 C of this sample
If a mixture of heptane (bp = 98C) and octane (bp=126C) is places in a gas chromatography machine, at what temperature should the oven be set
For the setup in the above question, what is the value of Q, the reaction quotient, for this cell reaction at 25oC. 2Cr(s) + 3Br2(aq) --> 6Br-(aq) + 2Cr3+(aq)
a 200 gram sample of a large biomolecule was dissolved in 15 grams of carbon tetrachloride. the boiling point of this solution was determined to be 77.85 degees celcius. calculate the molar mass of the biomolecule.
A compressed air tank carried by scuba divers has a volume of 7.0 L and a pressure of 150 atm at 20C. What is the volume of air in the tank (in liters) at STP
Prepare 1.00L of a pH~12 buffer with a total phosphate concentration of 0.050 M.You have at your disposal the following compounds
Methanol, ethanol, and n-propanol are three common alcohols. When 5.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol.
Milk spoils about 5x as fast at 300 K as it does at 250 K. What is the apparent activation barrier for the "milk spoiling" reaction
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