單項(xiàng)選擇題

已知反應(yīng):
(1)H2(g)+Br2(1)=2HBr(g)ΔrHθm,1=-72.80kJ·mol-1
(2)N2(g)+3H2(g)=2NH3(g)ΔrHθm,2=-92.22kJ·mol-1
(3)NH3(g)+HBr(g)=NH4Br(s)ΔrHθm,3=-188.32kJ·mol-1
則NH4Br(s)的標(biāo)準(zhǔn)摩爾生成焓ΔfHθm為()kJ·mol-1

A.-270.83
B.270.83
C.-176.20
D.176.20


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