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Combustion of 6.51 mg of a compound yielded 20.46 mg carbon dioxide and 8.36 mg of water. At 100C and 760 torr pressure, 100 mL of the compound vapor weighed 275 mg.
Calculate:
a) Molecular weight
b) Empirical formula
c) Molecular formula
When 0.100 mol of toluene(C7H8(l)) is burned in this calorimeter, the temperature is raised by 0.615C. The equation for the combustion reaction is
Does the presence of water vapor affect the result? Explain why it does or does not have a large affect on the value obtained.
After 200 seconds has passed, what is the concentration of sulfates in the drinking water sample.
Which of the following involve an increase in the entropy of the system under consideration?
You are asked to prepare an aqueous solution of ethylene glycol (HOCH2CH2OH) with a mole fraction of 0.142.
Calculate the pressure in the flask in atmospheres and torr also If the sealed-tube manometer in had a height difference of 20.0 inches between the Hg levels?
Born-Haber cycles are called cycles because they form closed loops. If any five of the six energy changes in the cycle are known, the value of the sixth can be calculated.
It takes 46.0 to raise the temperature of an 10.9 piece of unknown metal from 13.0 to 24.7. What is the specific heat for the metal?
Salicylic Acid is used to make asprin. Salicylic acid contains 60.8 mass % Carbon, 4.4 mass % Hydrogen and 34.8 madd % of Oxygen. What is the empirical formula for Salicylic acid?
Write condensed structural formulas of two esters and a carboxylic acid that each have molecular formula C3H6O2.
A 40.0 mL sample of 0.150 M Ba(OH)2 is titrated with 0.400 M HNO3. Calculate the pH after the addition of the following volumes of acid, and plot the pH versus milliliters of HNO3added.
4Au + 8KCN + O2 + 2 H2O --> 4 KAu(CN)2 + 4 KOH what is the minimum amount of KCN (in g) needed to react with 15.6 g of gold?
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