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# Unit 5 Part 7 Moles Grams And Liters

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### Unit 5 Part 7 Moles Grams And Liters

1. 1. Part 7 – Moles into Grams and Liters
2. 2. WEIGHING (MASSING) IN CHEMISTRY <ul><li>Chemists use mass, and normally small masses such as grams. </li></ul><ul><li>However they must relate the mass of chemical back to the counting of individual atoms. </li></ul>
3. 3. The Gram Atomic Mass (GAM) <ul><li>gram atomic mass- the mass of one mole of an element. </li></ul><ul><li>The gram atomic mass numerically equals the atomic mass of the element in grams. </li></ul>
4. 4. Example: <ul><li>Find the gram atomic mass of the following elements: </li></ul><ul><ul><li>Na, Hg, Fe, S </li></ul></ul>
5. 5. Gram Formula Mass (GFM) <ul><li>gram formula mass- the mass of one mole of a compound. </li></ul><ul><li>For gram formula mass we add together the gram atomic masses of the elements which make up the compound. </li></ul>
6. 6. Example <ul><li>Find the gram formula mass of the following compounds: </li></ul><ul><ul><li>CoCl 2 , H 2 O, H 2 S0 4 </li></ul></ul><ul><li>Name these compounds. </li></ul>
7. 7. Converting between moles and grams of a substance. <ul><li>Conversions between moles and the mass of a substance uses the gram atomic mass or gram formula mass. </li></ul>
8. 8. To convert from moles to grams <ul><li>1. Find the gram formula mass of the compound or element your looking for. </li></ul><ul><li>2. Determine the number of moles you were given. </li></ul><ul><li>3. Multiply the number of moles by the gram formula mass. </li></ul>
9. 9. Example <ul><li>Find the mass of 0.160 mol H 2 O 2 . </li></ul><ul><li>Find the mass of 6.0 X 10 26 atoms of Be. </li></ul>
10. 10. To convert from grams to moles <ul><li>1. Find the gram formula mass of the compound you are looking for. </li></ul><ul><li>2. Determine the number of grams you were given. </li></ul><ul><li>3. Divide the number of grams you were given by the gram formula mass. </li></ul>
11. 11. Example <ul><li>Find the number of moles in each of the following: </li></ul><ul><ul><li>333g SnF 2 . </li></ul></ul><ul><ul><li>5.0 X 10 24 molecules of SnF 2 . </li></ul></ul>
12. 12. Try these on you own... <ul><li>Find the mass in each of the quantities below </li></ul><ul><ul><li>10.0 mol Cr </li></ul></ul><ul><ul><li>3.32 mol K </li></ul></ul><ul><ul><li>2.4 mol N 2 </li></ul></ul><ul><li>Find the number of moles in each of the quantities below </li></ul><ul><ul><li>10g H 2 O 2 </li></ul></ul><ul><ul><li>15g Ca(NO 3 ) 2 </li></ul></ul><ul><ul><li>50g C 20 H 42 </li></ul></ul>
13. 13. FINDING VOLUME IN CHEMISTRY
14. 14. The Volume of a mole of gas <ul><li>Although the volumes of 1 mol of a liquid or solid can vary greatly between different substances, the volume of 1 mol of the gas of any substance has the same volume, at equal temperature and pressure. </li></ul>
15. 15. <ul><li>1 mole of a gas of any substance occupies a volume of 22.4L at STP (standard temperature and pressure). </li></ul>
16. 16. Standard Temperature and Pressure (STP) <ul><li>Temperature and pressure can affect the volume of a gas. </li></ul><ul><li>In order to “standardize” experiments between scientist, we use a standard set of values to work with gases. </li></ul>
17. 17. <ul><li>Standard Temperature = 0°C </li></ul><ul><li>Standard Pressure = 1 atm (air pressure at sea level) </li></ul>
18. 18. Examples <ul><li>Determine the volume, in liters, of 0.600 mol of SO 2 gas at STP. </li></ul>
19. 19. Your turn… <ul><li>What is the volume at STP of 0.960 mol CH4? </li></ul><ul><li>Assuming STP, how many moles are in 89.6 L SO 2 ? </li></ul>
20. 20. Converting between units with moles <ul><li>The mole is the most useful way for chemists to express the amount of matter. </li></ul>
21. 21. Try these... <ul><li>Determine the volume in liters of 50g of SO 2 gas at STP. </li></ul>