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worksheet 1 (mole and molar masses)

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Name: _____________________________ ( ) Class: _________ Date: __________ 1. Find the number of moles of sodium atoms in 5 x 10 23 sodium atoms. 2. How many magnesium atoms are there in 0.25 moles of magnesium? 3. 1 mole of H2O molecules consist of 6 x 10 23 water molecules. (a) How many oxygen atoms are there in 1 mole of H2O? (b) How many hydrogen atoms are there in 1 mole of H2O? 4. Determine the number of moles in 0.25kg of gold. (A r of gold = 197) Secondary 3 Express Chemistry (with SPA) Chapter 9: The Mole Worksheet 1 (Mole and Molar Masses)

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Page 1: Worksheet 1 (Mole And Molar Masses)

Name: _____________________________ ( ) Class: _________ Date: __________

1. Find the number of moles of sodium atoms in 5 x 1023 sodium atoms.

2. How many magnesium atoms are there in 0.25 moles of magnesium?

3. 1 mole of H2O molecules consist of 6 x 1023 water molecules. (a) How many oxygen atoms are there in 1 mole of H2O?

(b) How many hydrogen atoms are there in 1 mole of H2O?

4. Determine the number of moles in 0.25kg of gold. (A r of gold = 197)

Secondary 3 Express Chemistry (with SPA)Chapter 9: The MoleWorksheet 1 (Mole and Molar Masses)

Page 2: Worksheet 1 (Mole And Molar Masses)

5. How many moles are there in 0.35g of methane (CH4)?

6. What is the mass of 0.75 moles of sodium chloride (NaCl) ?


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