CH111 Lecture Notes - Lecture 1: Si Base Unit, Molar Mass, Ionic Compound

• School: Benjamin Franklin Institute of Technology
• Department: Chemistry
• Course: CH111
• Professor: Hughes

Document Summary

Mole of anything contains 6. 022 x 1023 representative particles. There are 6. 022 x 1023 atoms in one mole anything, therefore: (6. 022 x 1023 atoms / 1 mole) x (2. 50 mole / 1 ) The denominator mole and numerator mol cancel out, leaving you multiplying avagadro"s number by. How would you determine how many moles are in 2. 50 x 10^20 atoms of fe? (2. 50 x10^20 atoms fe) x (1 mole/6. 022 x 10^23 atoms) The mass in grams of one mole of any pure substance. Ex: the molar mass of hydrogen is 1. 00794 grams/mole. There are 1. 00794 grams in one mole of hydrogen. On the periodic table under the element"s symbol. Calculate the mass in grams of 0. 0450 moles of chromium. Then multiply the molar mass by what"s given to cancel out moles to get grams. 0. 0450 moles x (51. 99 grams/1 mole) moles cancel out. Calculate the # of moles in 525 g of calcium.