CHEM 1127Q Lecture Notes - Lecture 6: Molar Mass, Hydrazine, Chemical Formula

• School: UConn
• Department: Chemistry
• Course: CHEM 1127Q
• Professor: Dr. Niluka Wasalathanthri

Document Summary

Chapter 3 - composition of substances and solutions. Calculated by summing the atomic weights of the atoms in the molecular formula of the compound. Formula mass is given in atomic mass units (amu) Defined as the number equal to the number of carbon atoms in exactly 12 grams of pure carbon-12 isotope. By definition, the mass of a mole of carbon-12 is exactly 12 grams. Indicates the simplest ratio between the atoms present in the compound. Indicates the actual ratio between the atoms present in a compound. Just like 1 dozen = 12 or 1 gross = 144. The molar mass of a substance is the mass in grams of one mole of the substance. Molar mass (mm) = mass (g) / # of moles (mols) Units of molar mass is grams per mole (g/mol) Beryllium (be) is a light metal used to fabricate transparent x-ray windows for medical imaging instruments.