Reference no: EM13112434
1) What is the molar concentration of a solution that is made by dissolving 6.30g of sodium chloride and diluting 1.00L?Report your answer to three significant figures.
2) In an experiment, 6.00g of Mg(s) was reacted completely with O2(g) to form MgO(s) and 148.5kJ of heat was evolved. What is the molar emthalpy of formation of MgO(s)? Report your answer in kJ/mol,to three significant figures.
3) What is the de Broglie wavelength of an electron travelling at 4.0X10^7 m/s? Report your answer in metres, in scientific notion, to two significant figures. (Me=9.109X10^-31 kg)
4) What is the energy of a photon having a wavelength of 610nm? Report your answer in joules, in scientific notion, to two significant figures.
5) Write the electron configuration of selenium.
6) Write the chemical equation for the reaction of CO2 with water.
7) What is the electron configuration o a Cu^3+ ion.
8) List the following ions in order of increasing ionic radius: O^2-, F-, Na+, Mg^2+.
9) List the following compounds in order of increasing lattice energy: NaCl, NaBr, MgO, CaO.
10) Draw a Lewis structure for PO4^3- that minimizes formal charges.
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Calculate the energy released in fission reaction
: You have 16 electrons, 16 protons, and 16 neutrons. You can combine them to make 8 Helium (He-4) atoms, 4 beryllium atoms (Be-8), 2 oxygen atoms (O-16), or one sulfur atom (S-32).
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Determine the density of solid krypton
: Krypton crystallizes as a fcc (face centered cubic unit cell) having an edge length of 559 pm. What is the density of solid Krypton?
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Write the electron configuration for a gallium atom
: Write down the second period elements (ie. lithium through neon), on order of increasing first ionization energy and Write the electron configuration for a gallium atom.
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Determine the mass composition of vitamin c
: In 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 molecul..
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Write the electron configuration of selenium
: Write the electron configuration of selenium. List the following compounds in order of increasing lattice energy: NaCl, NaBr, MgO, CaO.
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Calculate the ratio of rates of effusion of o2 versus cl2
: Calculate the ratio of rates of effusion of O2 versus Cl2. Record your answers to three significant figures. The concentration of CO2 in the atmosphere is 375ppm (by volume). What is the mole fraction of CO2 in the atmosphere?
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Define internal energy and enthalpy
: Define internal energy and enthalpy. What is the difference between the two? List the following gases in order of increasing root-mean-square speed, all at the same temperature: H2, He, O2, Ne
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Find the hybridization of xenon in lewis resonance structure
: Given the following data table of average bond enthalpies, estimate the ΔH^rxn for the reactions 2H2+O2-- 2H2O. What is the hybridization of xenon in each of your Lewis resonance structures?
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Determine the map of certain genes
: What information is needed to determine the map of certain genes? I know that you need to know the recombination frequencies, but what else?
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