## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 15 - Chemical Equilibrium - Exercises: 15.15b

#### Answer

$K_{c} = \frac{[CS_{2}][H_{2}]^4}{[H_{2}S]^2[CH_{4}]}$ homogeneous

#### Work Step by Step

The expression for Kc is the concentration of products raised to their respective stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients. For the reaction: CH4 + 2H2S CS2 + 4H2 we would have $K_{c} = \frac{[CS_{2}][H_{2}]^4}{[H_{2}S]^2[CH_{4}]}$ Since all reactants are in the gas phase, the reaction is homogeneous (same phase)

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