Moles and stoichiometry practice problems (from Chapter 3 in Brady, Russell, and Holum ’s Chemistry, Matter and its Changes, 3rd Ed.) ˚ Concept of mole/molar ratio ˚ 1) How many moles of sodium atoms correspond to 1.56x10 21 atoms of sodium? ˚ 2) How many moles of Al atoms are needed to combine with 1.58 mol of O atoms to make. Tutorial 4 SOLUTION STOICHIOMETRY. Once moles are found the process is the same as shown in Tutorial 3, p T-23. What mass of silver chloride will be formed? 18) 15.0 mL of 0.200 M barium chloride solution is mixed with 25.0 mL of 0.250 M silver nitrate solution. What mass of silver chloride will be formed?
You must first find the molar mass of the element or compound.Use the periodic table (see the link to the left of the answer). Ifthe chemical is an element, just read off the atomic mass from theperiodic table. If it is a compound, you must know the molecularformula, and then you find the total molar mass of the compound byadding up the atomic masses of each atom in the compound.