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Assorted General Chemistry Problems

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1) In a combustion analysis, 2.00mg of vitamin C yielded 3.00mg CO2 and 0.816mg H2o. From mass spectrometry, it was found that the molecular weight of vitamin C is 176amu. Determine the mass composition of vitamin C, its empirical formula, and its molecular formula.

2) What is the energy of the photon that is emitted when the state of an electron changes from n=4 to n=2, in a hydrogen atom?

3) What is the name of each of the three quantum numbers used to describe orbitals in atoms? What orbital characteristics does each quantum number describe? What are the limitations on the values of these quantum numbers?

4) The following table gaves the first ionization energies for the noble gas elements. Using electron configurations, explain why the first ionization energy decreases with increasing atomic number.

Element: He (2377kJ/mol), Ne (2088kJ/mol), Ar (1527kJ/mol),
Kr (1356kJ/mol), Xe (1176 kJ/mol), Rn (1042kJ/mol

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Assorted general chemistry problems about combustion, quantum numbers and ionization energies are solved with full working shown.

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Assorted General Chemistry Problems

1) List the following gases in order of increasing root-mean-square speed, all at the same temperature: H2, He, O2, Ne

2) Under what conditions of pressure and temperature is a real gas most expected to deviate from ideal gas behaviour?

3) What intermolecular interactions would be the strongest between molecules CH2Cl2?

4) List the following substances in order of increasing boiling point: H2O, H2S, H2Se, H2Te.

5) List the following compounds in order of increasing vapour pressure at 298K: pentane (C5H10), ethanol (C2H5OH), water (H2O)

6) Give one example of a molecular solid.

7) The Henry's Law constant for CO2 is 3.1X10^-2 molL^-1 atm^-1 at 298K. What is the concentration of dissolved CO2 in water exposed to an atmosphere of pure CO2 at 2.0atm? Report your answer to two significant figures.

8) What is the molarity of a solution prepared by dissolving 6.21g of glucose (C6H12O6) in 1.50L of water. Report your answer to the correct number of significant figures.

9) List the following solutions in order of increasing freezing points: 0.1 m NaCl(aq), 0.1 m MgCl2(aq), 0.1 m glucose.

10) Define internal energy and enthalpy. What is the difference between the two?

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