@X@user.full_name@X@ @GMU: What is the wavelength of a line in the Brackett series of the hydrogen spectrum, if the transition occurs from ni = 9 to nf = 4? Remember the Rydberg constant is 1.097×10-2 nm-1

@X@user.full_name@X@ @GMU: Draw the Lewis dot structure of CO2. How many lone-pairs of electrons (first) and bonding pairs of electrons exist on the molecule CO2?

@X@user.full_name@X@ @GMU: A compound contains only lithium and fluorine. A sample weighing 7.46 g of this compound contained 2.00 g of lithium. How many grams of fluorine would there be in another sample of this compound containing 5.90 g of lithium?

@X@user.full_name@X@ @GMU: When 10.893 g of Al reacted with an excess of oxygen, a 31.63 % yield of Al2O3 was obtained. How many grams of Al2O3 were produced?4Al(s) + 3O2(g) → 2Al2O3(s)

@X@user.full_name@X@ @GMU: How many grams of H2 must one react with a stoichiometric amount of O2 to produce -771.6 kJ?2H2(g) + O2(g) → 2H2O(g) ΔH = -484 kJ

@X@user.full_name@X@ @GMU: What is the molecular shape of SeF4?

@X@user.full_name@X@ @GMU: NO2 at 378°C decomposes to form NO and O2 according to second order kinetics (see reaction below). The half-life for this reaction was measured to be 2.56e1 s when the initial concentration of NO2 was 9.54e-3 M. What is the rate constant for this reaction?2NO2(g) → 2NO(g) + O2(g)

@X@user.full_name@X@ @GMU: What is the conjugate base and base dissociation constant of HCN if its acid dissociation constant is 4.900×10-10 ?

@X@user.full_name@X@ @GMU: Which product in the reaction below is a base (this one first in the answer) and which product is an acid?ClO-4 + HClO → HClO4 + ClO-

@X@user.full_name@X@ @GMU: How much energy in kJ is released to form one mole of 204Pb from protons, electrons, and neutrons if the nucleus has a mass of 203.973020 amu? The masses of the proton, electron and neutron are 1.00728 amu, 0.000549 amu and 1.00867 amu, respectively.