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Calculate the atomic mass of neon (Ne) which is composed of three naturally occurring isotopes with the following natural abundances and masses:
a) 90.51% Ne - 20 (mass = 19.992 amu) b) 0.27% Ne - 21 (mass = 20.993 amu) c) 9.22% Ne - 22 (mass = 21.991 amu) Show your work.
8. Essay (1 points) 1.0000000000 Moles
How many moles of carbon are there in a diamond weighing 2.11 grams? Show your work.
9. Essay (1 points) 1.0000000000 Isotopes
Determine the number of protons, neutrons and electrons in each of the following:
Protons Neutrons Electrons
10. Essay (1 points) 1.0000000000 Electron Configurations
How many valence electrons are in each of the following elements?
nonbonding domains, polarity, intermolecular attractive forces, and which IMAF is the most important
Calculate the equilibrium value of Pb+2(aq) in 1.00 L of saturated PbCl2 solution to which 0.250 moles of NaCl(s) has been added. Assume that no volume change occurs.
Look at the structures of each and rationalize the difference in Mp. Which intermolcular force dominated in this case? (2pts) a.)H-bonding b.)Dispersion c.)Dipole
Ethylene gycol has a density of 1.11g/mL. What is the volume of 30.0 g of ethylene glycol?
Sulfamic acid is a primary standard that can be used to standardize NaOH. What is the molarity of a sodium hydroxide solution
Calculate the volume of 1.94×10-3-M H2SO4 solution needed to provide 4.83×10-3 g of H2SO4.
To determine the empirical formula of ester, 1.02g of the ester was burnt completely in excess oxygen. The only products formed were 2.20g of carbon dioxide and .90g water vapor. Calculate the mass of oxygen in 1.02g of the compound.
Carry out a calculation that would show only Al(OH)3, but not Mg(OH)2, will form precipitate in a solution that contain 0.10 M Al3+ and 0.10 M Mg2+ if the solution is buffered at pH = 9.00.
Consider a glass of 215 mL of water at 28°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved.
calorimetry can be used to find heats of combustion. suppose a calorimeter helps someone to determine that 4032 kj of heat is released during the combustion of 88.0 grams of propane, C3H8 (44.0 g/mol).
To obtain the same antifreeze protection requires 76 g of propylene glycol to replace each 62 g of ethylene glycol. Calculate the mass of propylene glycol required to replace
Calculate the concentration of chloride ions when 100.0 mL of 0.205 M sodium chloride is mixed with 250.0 mL of 0.150 M calcium chloride.
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