Calculating the amount of substances.pptx

This Slides explains the calculation of substances in a given amount and reaction.

1. MODULE 9 Calculating the amount of substances By Sir MJ BC GENERAL CHEMISTRY 1

2. ✅ AMOUNT Get well soon 3 x day ✅ DOSAGE REACTION

3. LEARNING TARGETS Determine formula and molecular masses ; and Calculate the percent composition by mass of substances.

4. Molar mass The Molar Mass, also known as Molecular Weight , is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It represents the sum of the atomic masses of all the atoms in a given molecule.

5. Molar mass Molar mass is the weight of one mole of a chemical substance. A mole is a unit in chemistry that quantifies the amount of a substance, and it corresponds to Avogadro's number, 6.022×10 23 entities (atoms, molecules, ions, etc.).   Hydrogen - 1.01 g/mol x 2 atoms = 2.02 Oxygen - 16.00 g/mol x 1 atom Molar mass H 2 = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol.

6. Calculating the Molar Mass of C 6 H 14 N 4 O 2 Substance # of Atom Atomic Mass Molar Mass Carbon 6 12.01 g/mol 72.06 g/mol Hydrogen 14 1.01 g/mol 14.14 g/mol Nitrogen 4 14.01 g/mol 56.04 g/mol Oxygen 2 16.00 g/mol 32.00 g/mol Molar Mass of Arginine : 174.24 g/mol x +___________ =

7. Calculating the Molar Mass of Al 2 (SO 4 )3 Substance # of Atom Atomic Mass Molar Mass Aluminum 2 27 g/mol 54 g/mol Sulfur 3 32 g/mol 96 g/mol Oxygen 12 16 g/mol 192 g/mol x +___________ = Molar Mass of Aluminum Sulphate : 342 g/mol

8. Mass Percent The percentage by mass of each element or component in a compound or mixture. It's a way to express the proportion of each element or component relative to the total mass. Find the Molar Mass of the Compound : Calculate the total molar mass by summing the molar masses of all the elements in the compound. Calculate the Mass of Each Element : Multiply the atomic mass of each element by the number of atoms of that element in the compound. Calculate Percent Composition : Use the formula: Mass Percent x 100%  

9. Calculating the Percent Mass of KMnO 4 Substance # of Atom Atomic Mass Molar Mass % Composition Potassium 1 39.10 g/mol 39.10 g/mol 24.74% Manganese 1 54.94 g/mol 54.94 g/mol 34.76 % Oxygen 4 16.00 g/mol 64 g/mol 40.50 % Compound Mass of Potassium Permanganate : 158.04 g/mol 100% x +_________ Mass Percent x 100%  

10. Calculating the Percent Mass of Na 2 CO 3 Substance # of Atom Atomic Mass Molar Mass % Composition Sodium 2 23.00 g/mol 46.00 g/mol 43.39 % Carbon 1 12.01 g/mol 12.01 g/mol 11.33 % Oxygen 3 16.00 g/mol 48 g/mol 45.28 % Compound Mass of Sodium Carbonate : 106.01 g/mol 100% x +_________ Mass Percent x 100%  

11. Calculate the Percent Mass of Ca 10 (PO 4 ) 6 (OH) 2 Substance # of Atom Atomic Mass Molar Mass % Composition Calcium 10 Phosphorous 6 Oxygen 26 Hydrogen 2 Compound Mass of Calcium Hydroxyapatite x +_________ Mass Percent x 100%   Try This!

12. Calculate the Percent Mass of Ca 10 (PO 4 ) 6 (OH) 2 Substance # of Atom Atomic Mass Molar Mass % Composition Calcium 10 40.08 g/mol 400.8 g/mol 39.89 % Phosphorous 6 30.97 g/mol 185.82 g/mol 18.50 % Oxygen 26 16.00 g/mol 416 g/mol 41.41 % Hydrogen 2 1.01 g/mol 2.02 g/mol 0.20 % Compound Mass of Calcium Hydroxyapatite : 1004.64 g/mol 100% x +_________ Mass Percent x 100%   Solution

13. M r. & Ms. Q and A