已知反應(yīng),在767℃時(shí)Kθ=4.6,在667℃時(shí)Kθ=0.50,則反應(yīng)的熱效應(yīng)()
A.吸熱 B.放熱 C. D.無(wú)法判斷
在一定溫度下,反應(yīng)的Kθ=3.24。在該溫度時(shí)將0.300molH2和
0.300molCO2充入1.00L的容器中,當(dāng)系統(tǒng)達(dá)到平衡時(shí),CO的濃度(mol·L-1)將是()
A.0.193 B.0.514 C.0.611 D.0.247
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