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Using Molar Mass to Find the Grams of Chemical Needed For a Reaction.

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Presentation on theme: "Using Molar Mass to Find the Grams of Chemical Needed For a Reaction."— Presentation transcript:

1 Using Molar Mass to Find the Grams of Chemical Needed For a Reaction

2 Cancelling Units Remember: Converting 2g to mg ?mg = 2g x 1000mg = 2000mg 1g

3 Cancelling Units Remember: Converting 2g to mg ?mg = 2g x 1000mg = 2000mg 1g

4 Molar mass and grams Same Method: Converting 2g O2 to moles O2 ?mol = 2g O2 X

5 Molar mass and grams Same Method: Converting 2g O2 to moles O2 ?mol = 2g O2 X 1mol = mols O2 32.0g

6 Molar Mass and Grams Same Method: Converting 2g O2 to moles O2 ?mol = 2g O2 X 1mol = mols O2 32.0g Correct for Certainty = 0.06 mols O2

7 Molar Mass and Grams Converting 4mols CaO to g CaO ?g CaO = 4mols CaO X

8 Molar Mass and Grams Converting 4mols CaO to g CaO ?g CaO = 4mols CaO X 56.1g = 224.4g CaO 1mol

9 Molar Mass and Grams Converting 4mols CaO to g CaO ?g CaO = 4mols CaO X 56.1g = 224.4g O2 1mol Correct for Certainty = 200g

10 Try a few Convert 5.0g N2 to mols ?mols = 5.0g N2

11 Try a few Convert 5g N2 to mols ?mols = 5.0g N2 X 1 mol = 0.18mol N2 28.0g

12 Try a few Convert 10mol ZnCl2 to g

13 Try a few Convert 10mol ZnCl2 to g ?g = 10mol ZnCl2 X 136.4g = 1364g ZnCl2 1mol Correct for Certainty = 1300g ZnCl2

14 Assignment Worksheet: Calculating Moles and Grams using Molar Mass


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