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Isooctane problem

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Isooctane, C8H18, is the component of gasoline from which the term octane derives.
A) Write a balanced equation for the combustion of one mole of isooctane to yield CO2(g) and H2O(l).
B) What is the volume (in liters) of CO2 at STP?
C )The standard molar heat of combustion (delta Hrxn for the reaction is -5,456.6 kJ/mol. Calculate delta Hf for isooctane.

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2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O.
Each mole of C8H18 ...

Solution Summary

This solution looks at an Isooctane problem: balanced combustion equation, standard volume, heat of combustion.

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Algebra word problems

I am having difficulties with two practice word problems attached. Please help.

Word Problems:
1. The octane rating of a gasoline is a measure of the amount of isooctane in the gas. Subaru recommends 91-octane gasoline for the 2008 Legacy 3.0 R. How much 87-octane gas and 93-octane gas should Kelsey mix in order to make 12 gal of 91-octane gas for her Legacy?

2. A university bookstore recently sold a wirebound graph-paper notebook for $3.36 and a college-ruled notebook for $4.57. At the start of spring semester, combinations of 50 of these notebooks were sold for a total of $205.51. How many of each type were sold?

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