In your project，there is：50% probability f
题型：单项选择题
问题：
In your project，there is：50% probability for $40000 profit，50% probability for $25000 loss．What is the expected profit in your project
A．$32500．
B．$25000．
C．$7500．
D．-$7500( loss of $7500)．
题型：单项选择题
已知H2(g)＋
O2(g)===H2O(g) ΔH＝－241.8 kJ·mol－1。下列说法中不正确的是 （ ）
A．H2的燃烧热为241.8 kJ·mol－1
B．2H2(g)＋O2(g)===2H2O(g) ΔH＝－483.6 kJ·mol－1
C．1 mol H2完全燃烧生成液态水放出的热量大于241.8 kJ
D．断开1 mol H2O的化学键吸收的总能量大于断裂1 mol H2和0.5 mol O2的化学键所吸收的总能量