已知:CO2(g)+3H2(g)CH3OH(g)+H2O(g)△H=-49.0k

题型:选择题

问题:

已知:CO2(g)+3H2(g) CH3OH(g)+H2O(g)  △H=-49.0 kJ·mol-1。一定条件下,向体积为1 L的密闭容器中充入1 mol CO2和3 mol H2,测得CO2和CH3OH(g)的浓度随时间变化曲线如下图所示。下列叙述中,正确的是  

[ ]

A. 升高温度能使 增大

B. 反应达到平衡状态时,CO2的平衡转化率为75%

C. 3 min时,用CO2的浓度表示的正反应速率等于用CH3OH的浓度表示的逆反应速率

D. 从反应开始到平衡,H2的平均反应速率v(H2)=0.075 mol·L-1·min-1

考点:影响化学平衡的因素化学反应速率的计算化学平衡的有关计算
题型:选择题

Do you know the man ______ himself ______ the disabled won the Nobel Prize for Peace yesterday?[       ]

A. devoted; to help

B. devoted; to helping

C. devoting; to help

D. devoting; to helping

题型:选择题

在下列运动方式中,增加坡度有助于增加训练强度的是()

A.步行

B.骑车

C.游泳

D.手摇车

E.有氧舞蹈

题型:选择题

黑色人种主要分布在[ ]

A.亚洲的西部

B.非洲的北部

C.非洲的中部和西部

D.欧洲

题型:选择题

hCG的稀释试验主要用于诊断()

A.早期妊娠

B.异位妊娠

C.先兆流产

D.滋养层细胞肿瘤

E.妊娠期高血压综合征

题型:选择题

Which of the following is NOT a recommended procedure for compliance with the Standards of Professional Conduct relating to misrepresentation The firm:()

A. specifically designates which employees are authorized to speak on behalf of the firm.

B. discontinues using the work completed by a former member or candidate.

C. provides a written list of the firm's available services and a description of

the firm's qualification.

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