# Entry Task: Feb 11th Monday

## Presentation on theme: "Entry Task: Feb 11th Monday"— Presentation transcript:

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!

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

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

Empirical Formula H3PO4 = 2.98 Moles of Hydrogen = 4 Moles of Oxygen
Second: Take the smallest mole amount and divided it into all others. 3.04 Moles of Hydrogen = 2.98 Moles of Hydrogen 1.02 Moles of Phosphorus 4.08 Moles of Oxygen = 4 Moles of Oxygen 1.02 Moles of Phosphorus 1.02 Moles of Phosphorus = 1 Moles of Phosphorus 1.02 Moles of Phosphorus H3PO4

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

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

Empirical Formula C2H3O2Na
Take the smallest mole amount and divided it into all others. 2.44 Moles of Carbon = 2.0 Moles of Carbon 1.22 Moles of Sodium 3.63 Moles of Hydrogen = 2.97 Moles of Hydrogen 1.22 Moles of Sodium 2.45 Moles of Oxygen = 2.00 Moles of Oxygen 1.22 Moles of Sodium 1.22 Moles of Sodium = 1 Moles of Sodium 1.22 Moles of Sodium C2H3O2Na

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

Empirical Formula KMnO4 = 1 Moles of Manganese
Second: Take the smallest mole amount and divided it into all others. 0.634 Moles of Manganese = 1 Moles of Manganese 0.628 Moles of Potassium 2.5 Moles of Oxygen = or 4 Moles of Oxygen 0.628 Moles of Potassium 0.628 Moles of Potassium = 1 Moles of Potassium 0.628 Moles of Potassium KMnO4

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

Empirical Formula Na2SiO3 = 2 Moles of Sodium
Second: Take the smallest mole amount and divided it into all others. 1.64 Moles of Sodium = 2 Moles of Sodium 0.817 Moles of Silicon 2.45 Moles of Oxygen = 2.99 or 3 Moles of Oxygen 0.817 Moles of Silicon 0.817 Moles of Silicon = 1 Moles of Silicon 0.817 Moles of Silicon Na2SiO3

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

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

Empirical Formula N2H8SO4
Take the smallest mole amount and divided it into all others. 1.51 Moles of Nitrogen = 2.0 Moles of Nitrogen 0.756 Moles of Sulfur 6.01 Moles of Hydrogen = 7.95 or 8 Moles of Hydrogen 0.756 Moles of Sulfur 3.03 Moles of Oxygen = 4 Moles of Oxygen 0.756 Moles of Sulfur 0.756 Moles of Sulfur = 1 Moles of Sulfur 0.756 Moles of Sulfur N2H8SO4

DO THE PRELAB!!!!