Chemistry Unit #3 Review PDF

What is the # for the mole? What how many moles is 6.022x10^23 atoms / particles? 1 Symbol / Unit for moles Avogadro’s constant number of individual particles Molar mass mass N = number of individual particles n = amount in moles...

What is the # for the mole? What how many moles is 6.022x10^23 atoms / particles? 1 Symbol / Unit for moles Avogadro’s constant number of individual particles Molar mass mass N = number of individual particles n = amount in moles (mol) NA = Avogadro’s m = mass in grams (g) constant M = molar mass (g/mol) Two formulas for finding # of moles n=N n=m NA M Formula for finding # of particles / atoms Number of individual particles: N = n x NA Calculate the number of atoms in 3.30 mol of potassium. Calculate the number of moles in 8.72 x 10^23 molecules of CO Calculate the molar mass of Na3PO4 Calculate the mass of 4.64 mol of C12H22O11 Calculate the moles of 101.98 g of CCl2F2 Calculate the number of molecules of 0.04 g of CuCl2  Q: A 2” tungsten cube weighs 2.30kg.How many atoms are in it?  Number of whole entities Q: A 2” tungsten cube weighs 2.30kg. How many atoms are in it? MW: = 183.84 g/mol x 1000 gW = 2300 g 2.30KgW 1 Kg W W 2300 gW x 1 molW = 12.51 mol W 183.84 gW 12.51 molW x 6.022x1023 atomsW = 7.53x1024 atoms W 1 mol  Number of whole entities Q: A 2” tungsten cube weighs 2.30kg. How many atoms are in it? MW: = 183.84 g/mol ALL AT ONCE: 2.30KgWx 1000 gW x 1 molW x 6.022x1023 atomsW 1 KgW 183.84 gW 1 molW = 7.53x1024 atoms  Q: How many hydrogen atoms are 1.00 L of water? Number of parts in an entity Q: How many hydrogen atoms are in 1.00 liters of water? MH2O: = 18.02 g/mol 1.00L H2O x 1000 mLH2O = 1000 mL H2O 1 LH2O 1000 mLH2O x 1 gH2O = 1000 gH2O 1mLH2O 1000 gH2O x 1 molH2O = 55.49 molH2O 18.02 g 55.49 molH2O x 6.022x1023moleculesH2O = 3.342x1025 moleculesH2O 1 molH2O 3.342x1025 moleculesH2O x 2 atomsH = 6.68x1025 atomsH 1 moleculeH2O