CHEM 1040 Lecture Notes - Lecture 14: Reagent, Sodium Hydroxide, Molar Mass

• School: University of Guelph
• Department: Chemistry
• Course: CHEM 1040
• Professor: Joe Prokipcak

Document Summary

Monoprotic acid: an acid that donates one hydrogen ion (proton) per molecule when in an aqueous solution. We will walk through some sample questions and note some tips and tricks today. We know: 5. 00g of cacl2, m of cacl2 is 110. 97gmol-1, n= m/m, # of molecules = n * 6. 022e23, cacl2 has ions ca2+ and cl, for every molecule of cacl2 there"s 1 ca2+ and 2 cl- We need: n of cacl2, number of ions. First, use n = m/m to find the number of moles of cacl2 in the 5. 00g sample. Now we need to find the number of ions in the sample. To do this, multiply the number of moles of cacl2 by the ion"s mole ratio, then by avogadro"s number. Ca2+: 0. 0451mol * 1 * 6. 022e23 = 2. 72 ions. We know: # of hydrogen atoms, 6 hydrogen atoms per ethanol molecule.