Holy Child School
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This 1 page Reader was uploaded by Natalia Narh on Wednesday January 21, 2015. The Reader belongs to CH221 at Holy Child School taught by Dr. M. Watts in Fall. Since its upload, it has received 145 views. For similar materials see Mole Concept in Chemistry at Holy Child School.
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Date Created: 01/21/15
Mole Concept A mole is the amount of substance that contains the same number of entities as the number of 129 of carbon 12 1 mole contains 6022 x1023 entities Mole tells us both the mass and the number of objects in a given mass of a substance Element The atomic mass unitamu of one atom of an element is the same numerically as the mass in gramsg f 1 mole of atoms of the element Eg 1 atom of carbon has mass 1201amu 1 mol6022 x1023 of carbon has a mass of 12019 Compound The mass in amu of 1 moleculeformula units of a compound is the same numerically as the mass in gramsg of 1 mole of a compound Eg H20 has a mass of 1802amu and 1 mol6022 x1023 of H20 has a mass of 18029 NB Mole lets us relate the number of entities to the mass of the sample of those entities The mole maintains the same numerical relationship between mass on the atomic mass scaleamu and the mass of the macroscopic scalegrams g The subscripts of a compound refers to the individual atomions as well as to moles of atomsions Molar Mass Its the mass per mole of its entities gmol Conversion 0 moles to mass massg molemol x molar massgmol 0 mass to moles molesmol massg molar massgmol 0 moles to number of entities number of entities molemol x 6022 x1023 entitiesmol 0 number of entities to moles molemol number of entities x 1 6022 x1023 entitiesmol