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A sample of gasoline was run through the GC yielding several peaks indicating the components that made up the gasoline mixture. Uncertain of the amount of benzene in the gas, a pair of students taking instrumental analysis does an experiment using internal standards. Their results are as follows:
Standard solution of 10ppm of benzene and 10ppm toluene yield relative signals(Curve areas) of 1350:960.They then add 5 ml of a 20 ppm toluene to 5 ml of the unknown solution and relative signals of 1240:1100.
What is the concentration in ppm of the benzene?
Calculate pCd2 at each of the following points in the titration of 45.00 mL of 0.0070 M Cd2 with 0.0070 M EDTA in the presence of the auxiliary complexing agent NH3.
A 21.0-mL sample of an unknown H3PO$ solution is titrated with a 0.100M NaOH solution. The equivalence point is reached when 18.35mL of NaOH solution is added.
Use Hess's law and the measured mean enthalpy changes for the NaOH-HCl(36.2) and NH3-HCl(31.9) reactions to calculate the enthalpy change to be expected from the reaction: NaOH + NH4Cl----NaCl + NH3 +H2O
What is the sum of the stoichiometric coefficients when the reaction is balanced to lowest common denominator
In a titration experiment to determine the Ksp of Calcium Hydroxide, we titrated our prepared Ca(OH)2 solution with a standard hydrochloric acid solution
The hydrolysis of ethyl acetate (CH3COOC2H5) by sodium hydroxide yields ethanol (C2H5OH) and sodium acetate (NaO2CCH3) by the reaction shown
Assuming that the specific heat of water is 4.18 J/(g · °C), and that the heat absorption by the calorimeter is negligible, estimate the enthalpy of combustion per mole of anthracene.
Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water.
It is possible to define metallic character as we do in this book and base it on the reactivity of the element and the ease with which it loses electrons.
At a certain temperature the vapor pressure of pure benzene and pure toluene are 380 torr and 130 torr, respectively.
4 moles of nitrogen gas is placed inside a piston and cylinder device. The piston has a mass of 50 kg and an area of 0.05 m2. 100 kg of weights are placed on the piston. After coming to equilibrium the piston is locked into place.
Chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone.
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