Calculating Molar Mass of a Compound


 Curtis White
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1 Instructions for Conversion Problems For every conversion problem Write the number in the problem down with unit and a multiplication sign Decide which conversion factor you should use, Avagadro s or molar mass. Use your index card to determine which way you should use your conversion factor. Then write the conversion factor down next to the multiplication sign. Make sure your units cancel and you have the unit you re solving for on top. Remember all numbers must have units. Cancel your units then solve the problem. You should enter the numbers in your calculator just as you see them on your paper. The number you are given in the problem always goes first. If you have an exponent don t forget to use the 2 nd, button. This takes the place of the x10. So on your calculator it should read, 6.02E23. Then put your answer down in proper sig. figs and unit. Don t forget to look to see if there is an E at the end. Calculating Molar Mass of a Compound Remember to determine the molar mass of an element you look at the periodic table. We will only use 3 sig figs. If more than 3, round to proper number. If you have a compound, need to 1. write down each element in the compound in a column. 2. Next to the element write the number of each element. If you have a parentheses you must multiply the numbers inside by the one outside. 3. Next to the number of each element, write a multiplication sign (x). 4. Look up mass of each element on the periodic table and write it next to the times sign. 5. Place an = sign next to the mass of each element. 6. Multiply the number of each element by its mass and write the number next to the = sign. 7. Go to the last column and add the masses. This is your molar mass of a compound. Sometimes, you will need to use both factors to convert. Remember the Chemistry twostep. You just have to go from grams to mole then to particles or vise versa.
2 Mole to Mass Problems for an element Answers in Red A1. Determine the number of grams in 3.75 mol of iron. 209 A2. Determine the number of grams in 2.50 mol of lead. 518 A3. Determine the number of grams in 1.25 mol of zinc A4. Determine the number of grams in 1.75 mol of sodium A5. Determine the number of grams in 5.25 mol lithium A6. Determine the number of grams in 4.25 mol rubidium. 363 A7. Determine the number of grams in 1.50 mol barium. 206 A8. Determine the number of grams in 2.25 mol mercury. 452 A9. Determine the number of grams in 2.75 mol copper. 175 A10. Determine the number of grams in 3.25 mol chromium. 169 A11. Determine the number of grams in 3.50 mol manganese. 192 A12. Determine the number of grams in 4.50 mol Magnesium. 109 A13. Determine the number of grams in 4.75 mol gold. 936 A14. Determine the number of grams in 5.50 mol silver.594 A15. Determine the number of grams in 5.75 mol potassium. 225 A16. Determine the number of grams in 6.25 mol nickel. 367
3 Mole to Representative Particle B1. Calculate the number of formula units in 12.5 mol Calcium carbonate.7.53e24 B2. Calculate the number of molecules in 5.12 mol water. 3.08E24 B3. Calculate the number of atoms in 2.15 mol zinc. 1.29E24 B4. Calculate the number of formula units in 2.5 mol sodium carbonate. 1.5E24 B5. Calculate the number of molecules in 2.10 mol CCl E24 B6. Calculate the number of atoms in 1.25 mol iron. 7.53E23 B7. Calculate the number of formula units in 2.2 mol lithium chloride. 1.3E24 B8. Calculate the number of molecules in 11.5 mol CO. 6.92E24 B9. Calculate the number of atoms in 22.5 mol Rubidium. 1.35E25 B10. Calculate the number of formula units in 4.35 mol rubidium bromide. 2.62E24 B11. Calculate the number of molecules in 3.35 mol CO E24 B12. Calculate the number of atoms in 2.64 mol calcium.1.59e24 B13. Calculate the number of formula units in 1.23 mol potassium nitrate.7.40e23 B14. Calculate the number of molecules in 6.65 mol P 2 O E24 B15. Calculate the number of atoms in mol lead.9.181e24 B16. Calculate the number of formula units in 3.8 mol magnesium sulfite.2.3e24
4 Representative Particle to Mole C1. How many moles of calcium chloride contains 1.26 x formula units?2.09 C2. How many moles of CO 2 contains 2.16 x molecules?35.9 C3. How many moles of zinc contains 6.26 x atoms?1.04e4 C4. How many moles of sodium chloride contains 1.62 x formula units?2.69 C5. How many moles of CO contains 2.26 x molecules?3.75e10 C6. How many moles of silver contains 5.26 x atoms?8.74e5 C7. How many moles of sodium nitrate contains 1.26 x formula units?2.09 C8. How many moles of CCl 4 contains 1.26 x molecules?2.09 C9. How many moles of lead contains 3.26 x atoms?.542 C10. How many moles of potassium sulfate contains 1.26 x formula units?2.09 C11. How many moles of P 2 O 5 contains 1.26 x molecules?2.09 C12. How many moles of iron contains 2.2 x atoms?3.7e4 C13. How many moles of magnesium bromide contains 6.2 x formula units?1.0e3 C14. How many moles of CO 2 contains 2.6 x molecules?4.3e3 C15. How many moles of mercury contains 5.66 x atoms?9.40 C16. How many moles of rubidium iodide contains 7.61 x formula units?12.6
5 Grams to Mole Element D1. Determine the number of moles of arsenic in 1.90g D2. Determine the number of moles of magnesium in 9.1g..37 D3. Determine the number of moles of calcium in 1.234g D4. Determine the number of moles of potassium in 2.134g D5. Determine the number of moles of antimony in g D6. Determine the number of moles of sodium in.0189g.8.22e4 D7. Determine the number of moles of strontium in g D8. Determine the number of moles of rubidium in 6.05g D9. Determine the number of moles of titanium in 220 g.4.6 D10. Determine the number of moles of lead in 135 g..652 D11. Determine the number of moles of platinum in 3.56 g D12. Determine the number of moles of gold in 355 g.1.80 D13. Determine the number of moles of scandium in 1.420g D14. Determine the number of moles of mercury in 3650 g.18.2 D15. Determine the number of moles of lithium in g.7.5e4 D16. Determine the number of moles of aluminum in g.2.0e4
6 Mole to Mass for a Compound E1. Calculate the mass of 42.5 mol of potassium cyanide.2770 E2. Calculate the mass of 24.5 mol of potassium hypochlorite.2220 E3. Calculate the mass of mol of sodium nitrite.2795 E4. Calculate the mass of 2.50 mol of sodium dichromate.655 E5. Calculate the mass of mol of acetic acid E6. Calculate the mass of 3.45 mol of P 4 O E7. Calculate the mass of 4.53 mol of CH E8. Calculate the mass of 6.24 mol ammonium nitrate. 499 E9. Calculate the mass of 55 mol of calcium carbonate.5500 E10. Calculate the mass of.125 mol of magnesium phosphate E11. Calculate the mass of.1700 mol of aluminum oxalate E12. Calculate the mass of 220 mol of lithium chloride 9300 E13. Calculate the mass of 21.5 mol of magnesium oxide.8660 E14. Calculate the mass of.1060 mol of sulfuric acid E15. Calculate the mass of 105 mol of CCl E16. Calculate the mass of 232 mol of C 6 H 12 O
7 Mass to Mole for a Compound F1. Determine the number of moles present in 456g cupric nitrate.2.43 F2. Determine the number of moles present in 654g cupric sulfate.4.09 F3. Determine the number of moles present in 123g cupric phosphate..323 F4. Determine the number of moles present in 652g C 6 H F5. Determine the number of moles present in 315g plumbic chloride..903 F6. Determine the number of moles present in 25g of CH F7. Determine the number of moles present in 1.24g CO F8. Determine the number of moles present in 650g potassium hydroxide.12 F9. Determine the number of moles present in 312.0g aluminum nitrate F10. Determine the number of moles present in 45.3g magnesium chlorite..285 F11. Determine the number of moles present in.057g lithium iodide.4.3e4 F12. Determine the number of moles present in 227g strontium fluoride.1.80 F13. Determine the number of moles present in 12.60g barium acetate F14. Determine the number of moles present in 271.5g ferrous sulfite F15. Determine the number of moles present in 6020g manganous bromide.28.0 F16. Determine the number of moles present in 340g C 6 H
8 Particles to Grams G1. What mass of sodium hydroxide contains 4.58 x formula units?30.4 G2. What mass of CO contains 6.26 x molecules?291 G3. What mass of lead contains 3.26 x atoms?11.2 G4. What mass of lithium chloride contains 1.26 x formula units? 8.87E8 G5. What mass of C 5 H 10 contains 9.16 x molecules?1070 G6. What mass of mercury contains 1.26 x atoms?4.21e22 G7. What mass of calcium hydroxide contains 8.26 x formula units?10.2 G8. What mass of C 4 H 10 contains 1.16 x molecules? G9. What mass of lithium contains 1.26 x atoms?1.45e21 G10. What mass of magnesium nitrate contains 3.06 x formula units?7.52e8 G11. What mass of C 2 H 6 contains 6.24 x molecules?.0312 G12. What mass of platinum contains 2.57 x atoms?8.32e32 G13. What mass of calcium perchlorate contains 5.36 x formula units?2.13e8 G14. What mass of NO 2 contains 4.96 x molecules?3.79e4 G15. What mass of gold contains 8.42 x atoms?276 G16. What mass of barium hydroxide contains 3.01 x formula units?.855
9 Grams to Particles H1. Calculate the number of atoms in 65.0g lead.1.89e23 H2. Calculate the number of molecules in 45.0g NO.9.03E23 H3. Calculate the number of formula units in 351g lithium sulfide.4.59e24 H4. Calculate the number of atoms in 1050 g tungsten.3.44e24 H5. Calculate the number of molecules in 340g SO 2.3.2E24 H6. Calculate the number of formula units in 1.66g aluminum phosphate.8.19e21 H7. Calculate the number of atoms in 1123g of gold.3.432e24 H8. Calculate the number of molecules in 213g I E23 H9. Calculate the number of formula units in 452g magnesium carbonate. 3.23E24. H10. Calculate the number of atoms in 21.20g aluminum.4.727e23 H11. Calculate the number of molecules in 14.7g N 2 O E22 H12. Calculate the number of formula units in.05200g of BaSO E20 H13. Calculate the number of atoms in 52.12g titanium.6.553e23 H14. Calculate the number of molecules in 333g C 3 H E24 H15. Calculate the number of formula units in 342g strontium nitrate.9.71e23 H16. Calculate the number of atoms in 1520g cadmium.8.17e24
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