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Entry Task: Feb 11 th Monday Write the question down: Find the empirical formula of a compound containing: 37.5 % C, 12.6 % H, and 49.9% oxygen. You have.

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Presentation on theme: "Entry Task: Feb 11 th Monday Write the question down: Find the empirical formula of a compound containing: 37.5 % C, 12.6 % H, and 49.9% oxygen. You have."— Presentation transcript:

1 Entry Task: Feb 11 th Monday Write the question down: Find the empirical formula of a compound containing: 37.5 % C, 12.6 % H, and 49.9% oxygen. You have ~10 minutes!

2 Agenda: Go over Empirical Formula ws #2 HW: Empirical Formula pre-lab questions

3

4 Empirical Formula Find the empirical formula of a compound containing: 3.06 % Hydrogen, 31.63 % Phosphorus, and 65.30 % Oxygen. 3.06 g of Hydrogen 1 mole of H 1.0079 g of H --------- = 3.04 Moles of Hydrogen ------------- 31.63 g of Phosphorus 1 mole of P 30.974 g of P --------- = 1.02 Moles of Phosphorus ------------- 65.30 g of Phosphorus 1 mole of O 15.999 g of O --------- = 4.08 Moles of Oxygen -------------

5 Empirical Formula 3.04 Moles of Hydrogen = 2.98 Moles of Hydrogen Second: Take the smallest mole amount and divided it into all others. 1.02 Moles of Phosphorus 4.08 Moles of Oxygen = 4 Moles of Oxygen 1.02 Moles of Phosphorus H 3 PO 4 1.02 Moles of Phosphorus = 1 Moles of Phosphorus 1.02 Moles of Phosphorus

6 Empirical Formula Find the empirical formula of a compound containing: 28.05 % Sodium, 29.26 % Carbon, 3.66 % Hydrogen, and 39.02 % Oxygen. 28.05 g of Sodium 1 mole of Na 22.9 g of Na --------- = 1.22 Moles of Sodium ------------- 29.26 g of Carbon 1 mole of C 12.011 g of C --------- = 2.44 Moles of Carbon -------------

7 Empirical Formula Find the empirical formula of a compound containing: 28.05 % Sodium, 29.26 % Carbon, 3.66 % Hydrogen, and 39.02 % Oxygen. 3.66 g of Hydrogen 1 mole of H 1.0079 g of H --------- = 3.63 Moles of Hydrogen ------------- 39.02 g of Oxygen 1 mole of O 15.999 g of O --------- = 2.44 Moles of Oxygen -------------

8 Empirical Formula 2.44 Moles of Carbon = 2.0 Moles of Carbon Take the smallest mole amount and divided it into all others. 1.22 Moles of Sodium 3.63 Moles of Hydrogen = 2.97 Moles of Hydrogen 1.22 Moles of Sodium C 2 H 3 O 2 Na 2.45 Moles of Oxygen = 2.00 Moles of Oxygen 1.22 Moles of Sodium = 1 Moles of Sodium 1.22 Moles of Sodium

9 Empirical Formula Find the empirical formula of a compound containing: 24.56 % Potassium, 34.81 % Manganese, and 40.50 % Oxygen. 24.56 g of Potassium 1 mole of K 39.098 g of K --------- = 0.628 Moles of Potassium ------------- 34.81 g of Manganese 1 mole of Mn 54.9 g of Mn --------- = 0.634 Moles Manganese ------------- 40.50 g of oxygen 1 mole of O 15.999 g of O --------- = 2.5 Moles of Oxygen -------------

10 Empirical Formula 0.634 Moles of Manganese = 1 Moles of Manganese Second: Take the smallest mole amount and divided it into all others. 0.628 Moles of Potassium 2.5 Moles of Oxygen = 3.98 or 4 Moles of Oxygen 0.628 Moles of Potassium KMnO 4 0.628 Moles of Potassium = 1 Moles of Potassium 0.628 Moles of Potassium

11 Empirical Formula Find the empirical formula of a compound containing: 37.70 % Sodium, 22.95 % Silicon, and 39.34 % Oxygen. 37.70 g of Sodium 1 mole of Na 22.9 g of Na --------- = 1.64 Moles of Sodium ------------- 22.95 g of Silicon 1 mole of Si 28.086 g of Si --------- = 0.817 Moles of Silicon ------------- 39.34 g of oxygen 1 mole of O 15.999 g of O --------- = 2.45 Moles of Oxygen -------------

12 Empirical Formula 1.64 Moles of Sodium = 2 Moles of Sodium Second: Take the smallest mole amount and divided it into all others. 0.817 Moles of Silicon 2.45 Moles of Oxygen = 2.99 or 3 Moles of Oxygen 0.817 Moles of Silicon Na 2 SiO 3 0.817 Moles of Silicon = 1 Moles of Silicon 0.817 Moles of Silicon

13 Empirical Formula Find the empirical formula of a compound containing: 21.21 % Nitrogen, 6.06 % Hydrogen, 24.24% Sulfur, and 48.48 % Oxygen. 21.21 g of Nitrogen 1 mole of N 14.007 g of N --------- = 1.51 Moles of Nitrogen ------------- 6.06 g of Hydrogen 1 mole of H 1.0079 g of H --------- = 6.01 Moles of Hydrogen -------------

14 Empirical Formula Find the empirical formula of a compound containing: 21.21 % Nitrogen, 6.06 % Hydrogen, 24.24% Sulfur, and 48.48 % Oxygen. 24.24 g of Sulfur 1 mole of S 32.065 g of S --------- = 0.756 Moles of Sulfur ------------- 48.48 g of Oxygen 1 mole of O 15.999 g of O --------- = 3.03 Moles of Oxygen -------------

15 Empirical Formula 1.51 Moles of Nitrogen = 2.0 Moles of Nitrogen Take the smallest mole amount and divided it into all others. 0.756 Moles of Sulfur 6.01 Moles of Hydrogen = 7.95 or 8 Moles of Hydrogen 0.756 Moles of Sulfur N 2 H 8 SO 4 3.03 Moles of Oxygen = 4 Moles of Oxygen 0.756 Moles of Sulfur = 1 Moles of Sulfur 0.756 Moles of Sulfur

16 DO THE PRELAB!!!!


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