Solving Stoichiometry Problems

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Presentation transcript:

Solving Stoichiometry Problems Objectives: 1. Name four major categories of stoichiometry problems. 2. Explain how to solve each type of stoichiometry problems.

Mole-Mole Problems 0.87 mol Al 6 HCl = 2.6 mol HCl Problem: How many moles of HCl are needed to react with 0.87 moles of Al? Step 1: Balance The Equation Step 2: Set up the equation identifying the given and the want 0.87 mol Al HCl Al Step 3: Calculate the new moles using the ratios of coefficients from the balanced equation 0.87 mol Al 6 HCl = 2.6 mol HCl 2 Al

Mass-Mass Problems (MassgMol; MolgMol; MolgMass) Problem: How many grams of Al can be created decomposing 9.8g of Al2O3? Step 1: Balance The Equation Step 2: Calculate the moles of the given (mol/g) Step 3: Calculate the moles of the new substance using the molar ratios Step 4: Calculate the new mass using the new moles

Solutions to Common Problems particles mass volume Mole given New mole using ratios / 6.02x1023 / molar mass x 6.02x1023 / 22.4L x molar mass x 22.4L Mole to mole using the ratio of coefficients