Question

General Chemistry Workshop 9: The Mole The mole is the unit of measurement for an amount in chemistry and physics. It is defined as the amount of sample that contains as many items as there are atoms in 12 grams of carbon 12 ( isotope). The number of items in 1 mole is called the Avogadro's number NA - 6.022141 x 100 1/mol Mole in science, just like a dozen in our everyday life, allows us to quickly count or compare large (huge!) quantities of items (microscopic objects). And since mole is just a number - you can have a mole of anything.atoms, molecules, ions, electrons, photons, etc. For any substance, the number of grams in 1 mole is the same as the number of atomic mass units in the molecular weight of the substance. The molar mass (or molar weight of a chemical substance is defined as the mass in grams of 1 mole of that substance. The units for molar mass are grams per mole - g/mol. The mole provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory or in the industrial setting. For example, it allows chemists to determine how many grams of each of the reactants are needed to produce a sought number of grams of product. Part 1: Discussion of mole and mass Discuss these questions among your group members: think about water molecules (1.0) and sugar molecules ( C H2011) and try to predict the answers in the table below. Just predict .do not use calculator. Do these samples have the same I gram of each mole of each ...volume? number of moles? number of molecules? number of atoms?

Answer 1

Gien l gm of taeh = Same mass mole of Eath Imol 0 19 (6+2)) tmob of CaHa (a) (a) +da) + 11 (16) 34ag Imals H0 I molb of Ga Ha30, hau aitint maas Volum 1 gram dpend on the dunoity ef the oubstana uhen sugans due adcid to watu, thy sink Olown Sugau ae denserthan watu). density= Igm Mass maos Volume Volumes will diffeuntadenailis au afeu sat 1mole 0f Eactyvolinsitieo ae diffount, Volumes ane ditferent mol wt o Ho 189, mol tot of no o moles 2 no molu o/ H0 78 ci ffeont 34.2 / mole of Each no of molu of Ha0 Same

I mole 6.023 xlo molacules 1gm no of molecule 18 23 6-023 x1D motecules n0.of tmoles COWARY aiferent ( a:f no ey mo tu o 1 motecule I mole no.of molecule in Imot of Hoo= 6.023 x10 moteculas Same ho molicule in Imol of thaH, , b-023x103 moticul no ef atom: on Ho molecule: 3 atems 5093x1023 atom in no of atom 6.003x1029x45 atom no of atoms in 1 324 324 diffeunt 12+22+11= 45 il Imole 6.023 x105x3 a toms no of atomi Imole of Hoo di ffeene 6.023 x10 5 aloms ho.of atoms Imote of pHas ou nned with Scanner