Mole Concept Puzzle?

📌 CONCEPT: The mole concept is a fundamental idea in chemistry that relates the amount of a substance to its molar mass, allowing us to calculate the mass of a substance from the number of moles used.

📐 RULE / FORMULA: The relationship between moles and mass is given by the formula: Mass (in grams) = Number of moles × Molar mass.

💡 WORKED EXAMPLE: Let's calculate the mass of water used by the chemist. Given that 1 mole of water weighs 18 grams, and the chemist used 1.2 moles of water, we can calculate the mass as follows: Mass = 1.2 moles × 18 grams/mole = 21.6 grams. Therefore, the mass of water used by the chemist is 21.6 grams.

⚠️ COMMON MISTAKE: Students often forget to multiply the number of moles by the molar mass, leading to incorrect calculations.