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That depends on whether or not the reaction is taking place in a closed or open vessel.
3H2 + N2 ==> 2NH3 Note there are more moles of gas on the left so if temp increases in a closed system, the pressure will increase, and so equilibrium will shift to the right where there are fewer moles of gas.

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Q: The equation shows the formation of ammonia from nitrogen and hydrogen. How will increasing the temperature affect the equilibrium?
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