Chemistry Stoichiometry Solution: A major component of gasoline is octane (C8H18). W...

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Solution: A major component of gasoline is octane (C8H18). When octane is burned in air, it chemically reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O). What mass (grams) of octane is consumed by the reaction of 8.5 g of oxygen gas? Round your answer to 2 significant digits.

Problem

A major component of gasoline is octane (C8H18). When octane is burned in air, it chemically reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O). 

What mass (grams) of octane is consumed by the reaction of 8.5 g of oxygen gas? 

Round your answer to 2 significant digits.


Solution

We’re being asked to calculate the mass of octane (C8H18) consumed by the reaction of 8.5 g O2


For this problem, we need to do the following steps:

Step 1: Write and balance a chemical equation for the given reaction.

Step 2: Calculate the mass of C8H18 consumed.



Step 1: From the problem, the given reaction is:

C8H18 + O2 → CO2 + H2O


This equation is not yet balanced. To balance it, we have to make sure that the number of elements on both sides is equal.


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