Stoichiometry_molar_mass_presentation.pptx

Chemistry

1. Stoichiometry

2. the branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions.  It essentially involves calculating the amounts of substances consumed or produced in a chemical reaction.

3. Molar Mass

4. What is Molar Mass? Molar mass is the mass of one mole of a substance. It is expressed in grams per mole (g/mol). I t tells us how much 6.022 × 10²³ particles (atoms, molecules, or ions) of a substance weigh.

5. Why is Molar Mass Important? Helps in converting between mass and moles. Important in chemical calculations (stoichiometry). Used to identify substances.

6. Steps to Compute Molar Mass 1. Write the chemical formula of the substance. 2. Find the atomic masses of each element from the periodic table. 3. Multiply each atomic mass by the number of atoms of that element in the formula. 4. Add up all the values to get the molar mass.

7. Example: Molar Mass of H₂O Step 1: Chemical formula: H₂O Step 2: Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol Step 3: (2 × 1.01) + (1 × 16.00) Step 4: 2.02 + 16.00 = 18.02 g/mol The molar mass of H₂O is 18.02 g/mol.

8. Practice Problem Find the molar mass of CO₂.

9. Practice Problem Find the molar mass of NH 4 .

10. Practice Problem Find the molar mass of C 6 H 12 O 6 .