Question

15. The Basic Problem In this section we will practice calculating the amounts of products produced in a chemical reaction using the three-step method. This method can be shortened later by combining the steps. 1 mole Step 1. Convert to moles: multiply grams by Tarla mass is grams Step 2. Use the chemical equation to relate the products to the reactants. Multiply the answer from Step 1 by the confident of the product you are calculating The coefficient of the reactant moles by Step 3. Convert to grams:: multiply moles by Lormula massim grams mole Example 1. How many grams of phosphorus can be formed by the decomposition of 42.9 grams of P20s given the equation: 2 P2054 P+ 502 Formula Masse: Step 1. Convert to moles: multiply grams by formula mass i grams Step 2. Use the chemical equation to relate the products to the reactants. Multiply the result from Step 1 by The coefficient of the product you are calculating The coefficient of the reactant Step 3. Convert the result from Step 2 to grams. Multiply 0.604 moles phu Cermula mass in grams 1 mole

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Answer 1

Formula masse: P₂O₅ = (2 x atomic mass of 'P') + ( 5 x atomic mass of 'O')

P₂O₅ = (2 x 30.973762 ) + (5 x 15.9994 ) = 141.9 g/mol

Step 1: 42.9 g x [1 mole / 141.9445 g] = 0.302 moles

Step 2: 0.30223080147 moles x [ 4 / 2 ] = 0.604 moles P

Step 3: 0.604 mol x ( 30.973762 g / 1 mole) = 18.7 grams

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