單項(xiàng)選擇題在732K時(shí)反應(yīng)NHCl(s)NH3(g)+HCl(g)的△G為-20.8kJ·mol-1,△H為154kJ·mol-1,則反應(yīng)的△S為()J·mol-1·K-1

A.587
B.-587
C.239
D.-239


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