下列有关阿伏加德罗常数NA说法正确的有 (      )项 ①电解精炼铜

下列有关阿伏加德罗常数NA说法正确的有 (      )
电解精炼铜时,当阳极上质量减少6.4g时,电路上转移的电子数目为0.2 NA

1L 1.0mol·L-1NH4Cl2L 0.5mol·L-1NH4HSO4溶液含NH4+数目相同

0.2mol Zn与一定量浓H2SO4恰好完全反应,生成的气体分子数必为0.2NA
2mL0. 5 mol·Lˉ1Na2SiO3溶液滴入稀盐酸中制得H4 SiO4胶体,所含胶粒数为0.001NA
一定条件下,2molSO21molO2混合在密闭容器中充分反应后容器中的分子数大于2N

1molCH3COONa和少量CH3COOH形成的中性溶液中,CH3COO数目为NA

A2     B3    C4   D5

答案

B

相关题目

下列关于体温调节的叙述,正确的是()       A.  人体
下列关于体温调节的叙述,正确的是()       A.  人体体温调节属于神经调节       B.  当人处于炎热环境时,下丘脑温觉感受器兴奋      
The cat is      .You should take it to an animal hospital.       A. d
The cat is      .You should take it to an animal hospital.       A. dead         B. death        C. dying        D. died
 Let’s go _______  in the park.          A. walk         
 Let’s go _______  in the park.          A. walk            B. walks              C. walking          D. walked
“螳螂捕蝉,黄雀在后”描述的是生物之间的什么关系( )
“螳螂捕蝉,黄雀在后”描述的是生物之间的什么关系( ) A.合作 B.竞争 C.捕食 D.争斗
In 1993, New York State ordered stores to charge a deposit (押金) on beverage
In 1993, New York State ordered stores to charge a deposit (押金) on beverage (饮料) containers. Within a year, consumers had returned millions of aluminum (铝) cans and glass and plastic bottles
—Would you mind_______ to the town______ you visited last month? w_w w. k#s5_u
—Would you mind_______ to the town______ you visited last month? w_w w. k#s5_u.c o*m —Of course not. A.sending; which               B.being sent; which     C.to be sent; wh
下列关于生态系统信息传递特征的描述,正确的是( ) A.
下列关于生态系统信息传递特征的描述,正确的是( ) A.生态系统的物理信息都来源于环境 B.植物都通过化学物质传递信息 C.信息沿食物链从低营
The book-store _____ open until 8 at night every day. A. staysB. starts  C. bec
The book-store _____ open until 8 at night every day. A. staysB. starts  C. becomesD. turns

最新题目