Review of Laws Two samples of carbon monoxide are decomposed into their constituent elements. One sample produces 17.2 g oxygen and 12.9 g of carbon. The other sample produces 10.5 g of oxygen and 7.88 g of carbon. Show that these results are consistent with the law of definite proportions.

Review of Laws ctd Hydrogen and oxygen form both water and hydrogen peroxide. The decomposition of a sample of water forms 0.125 g hydrogen to every 1.00 g oxygen. The decomposition of a sample of hydrogen peroxide form 0.250 g hydrogen to every 1.00 g oxygen. Show that these results are consistent with the law of multiple proportions.

Review of Laws ctd A 7.83 g sample of HCN contains 0.290 g H and 4.06 g N. Find the mass of carbon in a sample of HCN with a mass of 3.37 g.

A A #p, n, e- ? Identify A? Review of Ch 2 A comes in three stable forms; A-24, A-25, A-26. These are known as __________. Which is the most abundant and how do you know? ? 26 12 A ? A 2+ #p, n, e- ? Identify A?

Review of Ch 2 ctd. Get amu from info about isotopes: amu = ∑ (mass isotope) (fractional abundance) Get info about isotopes from Mass Spectroscopy

Carbon has 3 naturally occurring isotopes (15 total) From the data, what would you expect the MS diagram to look like for C? C-12 98.9% C-13 1.08% C-14 0.02%

Conversions Molar Mass, MM = Avogadro’s Number, NA = Mass % =

Conversions ctd How could you find the # Ag atoms in a ring? Find the # of ibuprofen molecules in a table containing 200.0 mg of ibuprofen, C13H18O2.

Conversions ctd The FDA recommends that a person consume < 2.4 g of Na per day. What mass of NaCl, in g, can you consume and still be within the FDA guidelines? NaCl has 39% Na by mass. Butane, C4H10, is the liquid fuel in lighters. How many g of C are present within a lighter containing 7.25 mL of butane? dbutane = 0.601 g/mL

Ionic vs Covalent Li3N S2Cl2 Al2O3 N2O4 Mn2O3 Fe(NO3)3 Calcium hydroxide phosphorous pentaiodide Aluminum sulfate hexacarbon hexahydride

Empirical Formula vs Molecular Formula Define? Examples? What is the molecular formula of a compound whose MM is 60.10 g/mol and % composition is 39.97% C, 13.41% H, and 46.62% N? Go Over HW Problem: EF of Silver Oxide (from lab data)

Stoichiometry Nitric acid, HNO3, is a component of acid rain. Nitric acid forms when nitrogen dioxide, a common pollutant from electricity generation, reacts with oxygen and water in the atmosphere. A medium sized home produces about 16 kg of nitrogen dioxide per year. Assuming that there is enough oxygen and water in the atmosphere to adequately react, what mass of HNO3, in kg, can form from this amount of pollutant?

LR, theoretical yield, % yield Define? Go over HW problem