CHEM 1A03 Study Guide - Midterm Guide: Molar Mass

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David Brock

Document Summary

Qualitative analysis the identification or detection of a specific substanc. Chapter 6. 3 the mole - a unit of counting. Convenient number of molecules: mole (6. 02 1023) Avogadro"s constant (na) the number of entitles in one mole: 6. 02 1023. Mole - the amount of substance containing 6. 02 1023 entitles. E. g. one mole of sodium is 6. 02 1023 sodium atoms. Scientists can determine experimentally that there are 6. 02 1023 carbon atoms in 12g of c-12. Mass of one c-12 is 12u; mass of one mole of c-12 atoms is 12g. The mass, in grams per mole, of one mole of a substance. E. g. one mole of carbon atoms has a molar mass of 12. 01 g/mol. E. g. one mole of water molecules has a molar mass of 18. 02 g/mol. Calculate the molar mass of an oxygen gas. M cu(no3)2 = 63. 55 + (14. 01 + 3 16. 00) = 187. 57 g/mol. = 3(14. 01) + 12(1. 01) + 30. 97 + 4(16) = 149. 12g/mol.