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A 2.56 g sample of anthracene, C14H10, was burned to heat an aluminum calorimeter (mass=948g). The calorimeter contained 1.5 L of water with an initial temp of 20.5 C and a final temperature of 34.3 C.
Calculate the molar heat of combustion of anthracene.
Silicon tetrafluoride reacts with F- to produce the hexafluorosilicate ion, SiF6 2-. GeF4 behaves similarily, but CF4 does not. (A) Draw Lewis structures for SiF4, GeF6 2-, CF4. What is the hybridization of the central atom in each species
Calculate the approximate molarity of this solution from the volume, percent composition, and density.
What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water. Enter your answer in kilojoules per mole of compound t..
When it is present in aqueous solution, the metal strontium, Sr, exists as an ion with a charge of +2. Given this information, state the chemical formula of the metal salt, strontium nitrate.
A sample containing an unknown mixture of A and B is measured in a 1.00 cm path length cuvette and its absorbances are found to be 0.182 at 465 nm and 0.398 at 575 nm. What are the concentrations of the two dyes in the unknown
The value of the gas constant is 0.08206 L x atm/(mol x K). You may also find the conversion factors 1 atm = 760 torr and Tk = Tc + 273 useful.
Gaseous oxygen is held in two separate containers at identical temperature and pressure. The volume of container A is 6.48 L and it contains 0.785 mol of the gas. The volume of container B id 5.78 L. How many moles of the gas are in container B
Which one of these, E1, addition of H-X to alkenes, SN2, SN1, or acid catalyzed hydration of alkenes, does not have a reactive intermediate carbocation and why
If 129 g of ice at 0.0°C is added to 2.48 L of water at 77°C, what is the final temperature of the mixture
1. what mass of naohsnbspmust be added to 300 ml of hcl 0.25 m in order to completely neutralize this acid?2. during a
Heat evolved per mole of Mg 6) Change in enthalpy for the following specific reaction. Be sure to indicate the correct sign (- or +) for the change in enthalpy. Mg(s) + 2H(aq)===>Mg(aq)+H2(g)
there is no measurable difference between final and initial pH - that is why it is called a buffer E. final pH is 0.16 pH units lower than original pH
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