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C5H12(l)+8O2(g)5CO2(g) +6H2O(l) ΔH.=-3 540 kJ·mol-1 C5H12(l)+8O2(g)5CO2(g)+6H2O(g) ΔH.=-3 540 kJ·mol-1 C5H12(l)+8O2(g)5CO2(g)+6H2O(g) ΔH.=+3 540 kJ·mol-1 C5H12(l)+8O2(g)5CO2(g)+6H2O(l) ΔH.=+3 540 kJ·mol-1
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水是干重状态下细胞中含量最多的化合物 白天用H218O浇花草,周围空气的水、O2、CO2中会出现18O 苹果树不宜在热带地区栽种的主要限制因素是水 人体衰老的细胞内水分增多
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NaCl固体中含有共价键 CO2分子中含有离子键 12 6C.13 6C.14 6C是碳的三种核素 16 8O、17 8O、18 8O含有相同的中子数
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NaCl固体中含有共价键 CO2分子中含有离子键 12 6C.13 6C.14 6C是碳的三种核素 16 8O、17 8O、18 8O含有相同的中子数