Chem+Friday,+October+17,+2008

=Chem Friday, October 17, 2008=

3.02 Apply the mole concept, Avogadro’s number and conversion factors to chemical calculations: 3.03 Calculate quantitative relationships in chemical reactions (stoichiometry):  ** Calculate formula mass. ** 
 * Particles to moles.
 * Mass to moles.
 * Volume of a gas to moles.
 * Molarity of solutions.
 * Empirical and molecular formula.
 * Percent composition.
 * Moles of each species in a reaction.
 * Mass of each species in a reaction.
 * Volumes of gaseous species in a reaction.
 * Particles to moles **
 * Convert representative particles to moles and moles to representative particles. (Representative particles are atoms, molecules, formula units, and ions.)
 * Mass to moles **
 * Convert mass of atoms, molecules, and compounds to moles and moles of atoms, molecules, and compounds to mass.
 * Convert representative particles to mass and mass to representative particles.
 * Volume of a gas to moles **
 * Convert moles to volume and volume to moles at STP.
 * Molarity of a solution **
 * Calculate molarity given mass of solute and volume of solution.
 * Calculate mass of solute needed to create a solution of a given molarity and volume.
 * Solve dilution problems: M1V1 = M2V2.
 * Empirical and molecular formula **
 * Calculate empirical formula from mass or percent using experimental data.
 * Calculate molecular formula from empirical formula given molecular weight.
 * Percent composition **
 * Determine percentage composition by mass of a given compound.
 * Perform calculations based on percent composition.
 * Calculate using hydrates.
 * Students should be able to: **
 * Interpret coefficients of a balanced equation as mole ratios.
 * Use mole ratios from the balanced equation to calculate the quantity of one substance in a reaction given the quantity of another substance in the reaction. (given moles, particles, mass, or volume and ending with moles, particles, mass, or volume of the desired substance)

Molar Mass
How would you calculate the molar mass of an element and compound? What does it mean to count formula units?