甲烷是一种高效清洁的能源,0.25 mol甲烷完全燃烧生成液态水时放出222.5 kJ热量,则下列热化学方程式正确的是
A. 2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=+890 kJ·mol-1
B. CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=+890 kJ·mol-1
C. 2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=-890 kJ·mol-1
D. CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890 kJ·mol-1
高二化学单选题简单题
(4分)甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时,放出222.5kJ热量,则表示甲烷燃烧热的热化学方程式为。
高二化学填空题简单题查看答案及解析
甲烷是一种高效清洁的能源,0.25 mol甲烷完全燃烧生成液态水时放出222.5 kJ热量,则下列热化学方程式正确的是
A. 2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=+890 kJ·mol-1
B. CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=+890 kJ·mol-1
C. 2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=-890 kJ·mol-1
D. CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890 kJ·mol-1
高二化学单选题简单题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= -890 kJ·mol-1
B. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= +890 kJ·mol-1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= -890 kJ·mol-1
高二化学选择题中等难度题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列表示甲烷燃烧热的热化学方程式中正确的是
A.2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH=―1780 kJ·mol-1
B.CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
C.CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH=―890 kJ·mol-1
D.2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH=+ 1780kJ·mol-1
高二化学选择题中等难度题查看答案及解析
高二化学解答题中等难度题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A.2CH4(g) + 4O2(g) =2CO2(g) + 4H2O(l)ΔH= +890 kJ·mol-1
B.CH4(g) + 2O2(g) = CO2(g) +2H2O(l)ΔH= +890 kJ·mol-1
C.CH4(g) + 2O2(g) = CO2(g) +2H2O(l)ΔH=-890 kJ·mol-1
D.2CH4(g) + 4O2(g) = 2CO2(g) + 4H2O(l)ΔH= -890 kJ·mol-1
高二化学单选题中等难度题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= +890 kJ·mol-1
B. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= -890 kJ·mol-1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= -890 kJ·mol-1
高二化学选择题简单题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= +890 kJ·mol-1
B. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= -890 kJ·mol-1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= -890 kJ·mol-1
高二化学选择题简单题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= +890 kJ·mol-1
B. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= -890 kJ·mol-1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= -890 kJ·mol-1
高二化学选择题中等难度题查看答案及解析
甲烷是一种高效清洁的新能源,0.25mol甲烷完全燃烧生成液态水时放出222.5kJ热量,则下列热化学方程式中正确的是 ( )
A. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= +890 kJ·mol-1
B. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= +890 kJ·mol-1
C. CH4(g) + 2O2(g) == CO2(g) +2H2O(l) ΔH= -890 kJ·mol-1
D. 2CH4(g) + 4O2(g) == 2CO2(g) + 4H2O(l) ΔH= -890 kJ·mol-1
高二化学单选题中等难度题查看答案及解析