2 Chemistry Problem Solving Questions

timer Asked: Jul 24th, 2015
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Question description

1. The complete combustion of octane, C8H18, the main component of gasoline, proceeds as shown below.

2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)

(a) How many moles of O2 are needed to burn 1.00 mol of C8H18

(b) How many grams of O2 are needed to burn 1.75 g of C8H18

(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 3.35 gal of C8H18?

2. A piece of aluminum foil 0.560 mm thick and 1.11 cm square is allowed to react with bromine to form  aluminum bromide.

(a) How many moles of aluminum were used? (The density of aluminum is 2.699 g/cm3.) 

(b) How many grams of aluminum bromide form, assuming the aluminum reacts completely?

Tutor Answer

Carnegie Mellon University

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