題目列表(包括答案和解析)
A.H2O(g)====H2(g)+1/2 O2(g) ;ΔH=+242 kJ·mol-1
B.2H2(g)+O2(g)====2H2O(l) ;ΔH=-484 kJ·mol-1
C.H2(g)+1/2 O2(g)====H2O(g);ΔH=+242 kJ·mol-1
D.2H2(g)+O2(g)====2H2O(g) ;ΔH=+484 kJ·mol-1
A.H2O(g)H2(g)+1/2O2(g) ΔH=+242 kJ·mol-1
B.2H2(g)+O2(g)2H2O(l) ΔH=-484 kJ·mol-1
C.H2(g)+1/2O2(g)H2O(g) ΔH=+242 kJ·mol-1
D.2H2(g)+O2(g)2H2O(g) ΔH=+484 kJ·mol-1
A.H2O(g) H2(g)+1/2O2(g) ΔH=+242 kJ·mol-1
B.2H2(g)+O2(g) 2H2O(l) ΔH=-484 kJ·mol-1
C.H2(g)+1/2O2(g) H2O(g) ΔH=+242 kJ·mol-1
D.2H2(g)+O2(g) 2H2O(g) ΔH=+484 kJ·mol-1
已知在1×105 Pa,298 K條件下,2 mol氫氣燃燒生成水蒸氣放出484 kJ熱量,下列熱化學(xué)方程式正確的是
A.H2O ( g ) = H2 ( g ) + 1/2O2 ( g ) △H = +242 kJ/mol
B.2H2 ( g ) + O2 ( g ) = 2H2O ( l ) △H = -484 kJ/mol
C.H2 ( g ) + 1/2O2 ( g ) = H2O ( g ) △H = +242 kJ/mo
D.2H2 ( g ) + O2 ( g ) = 2H2O ( g ) △H = +484 kJ/mol
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