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4Na2S + Na2MoO4 + 4H2O = Na2 MoS4 + 8NaOH
H2SO4 + 2 NaOH = Na2SO4 + 2 H2O
Na2 MoS4 + H2SO4 = H2 MoS4 + Na2SO4
H2 MoS4 = MoS3  + H2S
MoS3 + H2 = MoS2 + H2S
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