1 / 22

Molar Mass and Mole Calculation Problems

Molar Mass and Mole Calculation Problems. Molar Mass. You need to calculate molar mass if you have more than one atom in a problem. It’s easy… just add the masses together and multiply time the number of atoms in the molecule (subscript)

ilya
Download Presentation

Molar Mass and Mole Calculation Problems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Molar Mass and Mole Calculation Problems

  2. Molar Mass • You need to calculate molar mass if you have more than one atom in a problem. • It’s easy… just add the masses together and multiply time the number of atoms in the molecule (subscript) • For example: H2O Hydrogen =1 Oxygen =16; There are 2 hydrogens and 1 oxygen so the total is 18g for molar mass…

  3. Give the molar masses of the following compounds: • 1. sodium fluoride NaF • (1 atom x 23 grams/mole of sodium) + (1 atom x 19 grams/mole of fluorine) = 42 grams/mole of sodium fluoride

  4. 2. potassium hydroxide KOH • (1 x 39 grams) + (1 x 1 gram) + (1 x 16 grams) = 56 grams/mole of potassium hydroxide

  5. 3. copper (I) chloride CuCl • (1 x 63.5 grams) + (1 x 35.5 grams) = 99 grams/mole of copper (I) chloride

  6. 4. manganese (IV) oxide MgO2 • (1 x 55 grams) + (2 x 16 grams) = 87 grams/mole of manganese (IV) oxide

  7. 5. calcium sulfate CaSO4 • (1 x 40 grams) + (1 x 32 grams) + (4 x 16 grams) = 136 grams/mole of calcium sulfate

  8. 6. magnesium phosphate Mg3(PO4)2) • (3 x 24 grams) + (2 x 31 grams) + (8 x 16 grams) = 262 grams/mole of magnesium phosphate

  9. How many moles of sodium are in 42 g of Na? • 1.8 mol Na

  10. How many moles of Oxygen are in 8.25 g of O? • 0.516 mol O

  11. How much does 2.18 mol of Cu weigh? • 139 g Cu

  12. What is the mass of 0.28 mol of iron? • 16 g Fe

  13. .    How many atoms are in 7.2 mol of chlorine? • 4.3 x 1024 Cl atoms

  14. .    How many atoms are in 36 g of bromine? • 2.7 x 1023 Br atoms

  15. How many moles are in 1.0 x 109 atoms? • 1.7 x 10-15 mol

  16. What is the mass of 1.20 x 1025 atoms of sulfur? • 639 g S

  17. How many moles of Carbon monoxide molecules are in 52 g of CO? • 1.9 mol

  18. .    How many moles of C2H6 are in 124 g? • 4.12 mol

  19. .    How many moles of CCl4 are there in 56 g? • 0.36 mol

  20. How much does 2.50 mol of H2SO4 weigh? • 245 g

  21. How much does 0.25 mol of Fe2O3 weigh? • 40. g

  22. How many molecules are there in 52 g of CO? • 1.1 x 1024 molecules

More Related