Which change to this reaction system

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Which change to this reaction system would cause the equilibrium to shift to the right?

N2 (g) + 3 H2 (g) ↔ 2 NH3 (g) + heat

heating the system
removal of H2 (g)
lowering the temperature
addition of NH3 (g)
addition of a catalyst

Reference no: EM131006623

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