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The vapor pressure and enthalpy of vaporization of an unknown substance are measured to be 204.2 torr and 28.8 kJ/mol, respectively at room temperature (298.15 K). Estimate the normal boiling point of the substance at an atmospheric pressure of 760 torr.
calculate the specific heat capacity of zinc given that a 65.5g sample loses 2008J of heat when cooled from 100.0 degrees celcius to 21.1 degrees celcius.
Calculate the minimum amount of triphenylmethanol required to prepare 10.0kg of triphenylmethyl methyl ether.
How many grams of Na3PO4 will be needed to produce 400ml of a solution that has a concentration of Na+ ions of 0.900 ?
Write balanced chemical equation and evaluate the molecular weight of the reactants and Calculate the molecular weights of the reactant.
Normally the alkaline earth carbonates (MCO3; M = Mg^2+, Ca^+2, Sr^+2, Ba+2) are insoluble in water. Why would the method used in this experiment work for calculating the molar mass of the alkaline earth? How would the calculations have to be cha..
"A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register 160 counts per minute. Eight hours later the detector counts at a rate of 10 counts per minute. What is the half-life of the material?"
What volume of 0.300 N NaOH would be required to bring 16.0 mL of distilled water that has a pH 7.00 to a new pH of 12.42?
A 1.00 g sample of an unknown acid required 17.0 mL of .650 M NaOH to neutralize. What is the molar mass of the unknown acid?
a pH meter measures the concentration of hydronium ions, H3O+ in solution through the creation of a concentration differential between a standard hydrogen half cell inside the pH probe and the concentration of hydronium ions outside the probe
Determine the mass of a mixture of 1.33x10^24 formula units of Sodium sulfate, 1.500 moles of Water and 3.77g of silver chloride?
The insecticide DDT has a half-life in the human body of about 7 years. That is, in 7 years its concentration.( Although DDT is no longer in use in the United States).
Calculate the ph at the equivalence point for titrating 0.170 solutions of each of the following bases with 0.170 M HBr.
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