One Ibmol of pentane gas (C3H12) reacts with the theoretical amount of air in a closed, rigid tank. Initially, the reactants are at 77°F, 1 atm. After complete combustion, the temperature in the tank is 3100°R. Assume air has a molar analysis of 21% O₂ and 79% N2. Step 1 Determine the final pressure in the tank, in atm. Pp Your answer is correct. Hint Step 2 6.07 * Your answer is incorrect. atm Determine the heat transfer, in Btu. Q = i 1857351.62 Btu Attempts: 1 of 4 used

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.