CHEM 111 Lecture Notes - Lecture 4: Unified Atomic Mass Unit, Dihydrogen Cation, Observable Universe

• School: BYU
• Department: Chemistry and Biochemistry
• Course: CHEM 111
• Professor: David Dearden

Document Summary

Ta office hours: put on ls self-assembling monolayer surface - hydrocarbon tails stick outward, tails stick out at an angle, would have to use sophisticated math to figure out the angle. 6. 022[1415] x 10^23 there are avogadro"s number of particles in a mole of any substance. Possible to measure the stars in the sky approx. 400billion stars in milky way the total number of stars in the observable universe is less than one mole. All atoms of the same element have the same number of protons in the nucleus, z. A boron can have a = 5p + 5n = 10 amu. Atomic weight tells us the mass of one atom of an element relative to one atom of another element. Or - the mass of 1000 atoms of one relative to 1000 atoms of another (or of 10^23 of one relaive to 10^23 of another-the number doesnt matter as long as its the same for both.