工業(yè)上常用天然氣作為制備CH3OH的原料.已知:
①CH4(g)+O2(g)?CO(g)+H2(g)+H2O(g)△H=-321.5kJ/mol
②CH4(g)+H2O(g)?CO(g)+3H2(g)△H=+250.3kJ/mol
③CO(g)+2H2(g)?CH3OH(g)△H=-90.0kJ/mol
(1)CH4(g)與O2(g)反應(yīng)生成CH3OH(g)的熱化學(xué)方程式為
2CH4(g)+O2(g)=2CH3OH(g)△H=-251.2KJ/mol
2CH4(g)+O2(g)=2CH3OH(g)△H=-251.2KJ/mol
.
(2)向VL恒容密閉容器中充入a mol CO與2a mol H2,在不同壓強(qiáng)下合成甲醇.CO的平衡轉(zhuǎn)化率與溫度、壓強(qiáng)的關(guān)系如圖1所示:
①壓強(qiáng)P1<
<
P2(填“<”、“>”或“=”)
②在100℃、P1壓強(qiáng)時(shí),平衡常數(shù)為(用含a、V的代數(shù)式表示).
(3)如圖2所示是甲醇燃料電池(電解質(zhì)溶液為稀硫酸)結(jié)構(gòu)示意圖,Pt(a)電極通入的M為甲醇
甲醇
,電極反應(yīng)式是CH3OH-6e-+H2O=CO2+6H+
CH3OH-6e-+H2O=CO2+6H+
.若用該電池電解CuSO4溶液,當(dāng)?shù)玫?.2g銅時(shí),參加反應(yīng)的氣體N的體積應(yīng)為2.24
2.24
L(標(biāo)準(zhǔn)狀況).