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A urine sample contains 46.5mgL-1 of ethanol. The density of ethanol is 0.79gcm-3. What is the concentration expressed as %v/v.
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: a solution that is 0.140 in propanoic acid and 0.125 in potassium propanoate.
The molar mass for NaCl and water are 58.443 g/mol and 18.015 g/mol, respectively. Calculate the partial molar volumes for NaCl and water in a 0.35m solution
Given the following heat capacities, (assume they are constant over the temperature range in consideration here), calcrulate enthalpy for the reaction 2NO + O2 ->2NO2 at 398k.
the pressure of a sample of a 1000 mL sample of gas at 10.0C increases from 700 mm Hg to 900 mm Hg. If the volume is unchanged, what is the new temperature
Predict that it was dissolved in HCl then mixed into the diethyl ether because diethyl ether is a base and since the benzoate contains an amine group they would remain unreactive with one another.
phosphate combines with sodium hydrogen phosphate to yield sodium tripolyphosphate and water
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0 C,the volume of the gas is 361 mL. To what temperature must the gas be heated to occupy a volume of 492 mL.
Hydrogen peroxide (H2O2) decomposes according to the equation H2O2(l) ? H2O(l) + (1/2)O2(g). Calculate Kp for this reaction at 25oC. (Ho = -98.2 kJ/mol, So = 70.1 J/K•mol)
The lid is tightly sealed on a rigid flask containing 3.50 L H2 at 17 °C and 0.913 atm. If the flask is heated to 71 °C, what is the pressure in the flask?
Assume that a particular reaction evolves 239 kJ of heat and that 27 kJ of PV work is gained by the system. what are the values of delta H and delta E? Assume that a particular reaction evolves 239 kJ of heat and that 27 kJ of PV work is gained..
using a solution of hoc2h23nhcl solution in which kb hoc2h23n 5.9 times 10-7 then determine what is the ph of a 0.010
as 3.6g soil sample was treated with hclo4 and hf was distilled from the mixture. the hf distillate was then diluted to
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