Review
Convert the following to moles: 6.74 g of oxygen gas. 2.38 mol O2 0.42 ol O2 0.421 mol O2 107 mol O2 none of the above
Convert the following to grams: 2.1 moles of water. 0.12 g H2O 38 g H2O 8.6 g H2O 0.026 g H2O none of the above
Convert the following to number of molecules: 7.301 grams of CH4. 0.4550 mol CH4 2.740 molecules of CH4  0.455 mol CH4
 2.740 * 10^{24} molecules of CH_{4}
none of the above
What is the molar mass of sodium oxide? 61.979 amu 38.999 amu 54.998 g/mol 61.979 g/mol none of the above
How many moles of hydrogen are in 3.12 moles of water? 6.24 mol H 3.12 mol H 1.56 mol H 6.24 mol H2  none of the above
 Posted on the board at the end of the block.
Homework

Standard(s)
 HSPS17.
 Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.
 Emphasis is on using mathematical ideas to communicate the proportional relationships between masses of atoms in the reactants and the products, and the translation of these relationships to the macroscopic scale using the mole as the conversion from the atomic to the macroscopic scale. Emphasis is on assessing students’ use of mathematical thinking and not on memorization and rote application of problemsolving techniques.
