4 Chem students notes (1).docx - Molar mass of a compound...

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Molar mass of a compound The molar mass (for molecules with covalent bonds) of H 2 O is 18 grams 2 x Hydrogen = 2 x 1 gram = 2 grams 1 x Oxygen = 1 x 16 grams = +16 grams 18 grams The formula (for ionic bonds) mass of CaCl 2 is 111 grams 1 x Calcium = 1 x 40 gram = 40 grams 2 x Chlorine = 2 x 35.5 grams = +71 grams 111 grams 1. What is the molar mass of HCl? 2. What is the molar mass of HClO 3 ? 3. What is the formula mass of NaF? 4. What is the formula mass of BeI 2 ? 5. I f I have 1.00 mole of H 2 O how many grams do I have ? 2 x Hydrogen = 2 x 1.0 gram = 2.0 grams 1 x Oxygen = 1 x 16.0 grams +16.0 grams 18.0 grams The molar mass of H 2 O is 18 gram 1.00 moleS H 2 O x 18.0 grams = 18.0 grams 1 1 mole 6. If you have 1 mole of HCl how many grams do you have? 7. If you have 2 moles of H 2 O how many grams do you have?
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2.00 moleS H 2 O x 18.0 grams = 36.0 grams 1 1 mole 8. If you have 2 moles of HCl how many grams do you have? 9. I f I have 3.50 moles of CaCl 2 how many grams do I have ? The formula mass of CaCl 2 is 111 grams 1 x Calcium = 1 x 40 gram = 40 grams 2 x Chlorine = 2 x 35.5 grams = +71 grams 111 grams The formula mass of CaCl 2 is 111 gram 3.50 moleS CaCl 2 x 111 grams = 389 grams 1 1 mole 10. I f I have 5.80 moles of CaCl 2 how many grams do I have ? Number of atoms If you have 1 molecule of H 2 O how many atoms do you have? 3 atoms If you have 1 molecule of HClO 3 how many atoms do you have?
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