Problem: In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. 2 A → 3B How many molecules of substance B are produced when 26.8 g of substance A reacts? The molar mass of substance A is 16.7 g/mol. Step 1: Convert the mass of A to moles.Step 2: Convert the number of moles of A to the number of moles of B. Step 3: Convert the number of moles of B to molecules of B.

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a. mass A to moles

moles A = 26.8 g (1 mol16.7 g )

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Problem Details

In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. 

2 A → 3B 

How many molecules of substance B are produced when 26.8 g of substance A reacts? The molar mass of substance A is 16.7 g/mol. 

Step 1: Convert the mass of A to moles.

Step 2: Convert the number of moles of A to the number of moles of B. 

Step 3: Convert the number of moles of B to molecules of B.

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