共回答了129个问题采纳率:87.5%
A.18g水的物质的量为1mol,标况下水不是气体,不能用气体摩尔体积计算其体积,其体积远远小于22.4L,故A错误;
B.氧气所处状态下,气体摩尔体积不一定是22.4L/mol,故22.4L氧气的物质的量不一定是1mol,不一定含有6.02×1023个氧分子,故B错误;
C.相同条件下,体积之比等于分子数目之比,20mLNH3与60mL N2所含的分子个数为1:3,故C正确;
D.80g氢氧化钠的物质的量为2mol,溶于水配成1L溶液,所得溶液的浓度为2mol/L,体积1L应是溶液的体积,不能是溶剂水的体积,故D错误,
故选C.
点评:
本题考点: 物质的量的相关计算.
考点点评: 本题考查气体摩尔体积、阿伏伽德罗定律、物质的量浓度,难度不大,注意气体摩尔体积的使用条件与对象.
--Can you go to the concert with us?
2024-04-291个回答
—Sorry,I can’t go camping with you.I have to prepare well en
2024-04-291个回答
------ Sorry, I can’t go camping with you. I have to prepare
2024-04-291个回答
---It’s a fine day. Why don’t you go camping with us?
2024-04-291个回答
—Sorry, I can’t go camping with you. I have to get ready for
2024-04-291个回答
找错题 并改正1) Would you like go camping with us?3) Helen,show ux
2024-04-293个回答
—Would you like to go camping with us this weekend?
2024-04-291个回答
─ Would you like to go camping with us this weekend? ─______
2024-04-291个回答
修改病句do you want go camping with us?
2024-04-2911个回答
如图,正方形ABCD中,E在CD上,且AE=EC+BC,M为CD重点.求证:∠BAE=2∠DAM如题
2024-04-291个回答
已知正方形ABCD,点E是BC上的一点,以AE为边做正方形AEFG
2024-04-295个回答
can he go with us?改为肯定句时us要不要改成you
2024-04-291个回答
高一 化学 .急 请详细解答,谢谢! (25 12:51:47)
2024-04-291个回答
高一 数学 急! 请详细解答,谢谢! (9 9:18:11)
2024-04-291个回答
高一 数学 数列 请详细解答,谢谢! (14 13:34:32)
2024-04-292个回答
can you go swimming with us同义句
2024-04-291个回答
高一 数学 急 请详细解答,谢谢! (25 18:39:47)
2024-04-292个回答
2024-04-294个回答
You can go with us,or you can stay here.You can _____go with
2024-04-2912个回答
How about going camping with us this weekend?
2024-04-297个回答
你能帮帮他们吗
因式分解(1)x2-9y2(2)2x(a-b)-(b-a)(3)x4-9x2(4)81x4-72x2y2+16y4.
2024-05-011个回答
2024-05-011个回答
2024-05-011个回答
把下列各式因式分解:(1)x2-9y2;(2)-64m2+81n2;(3)(2x+y)2-(x-2y)2;(4)169(
2024-05-015个回答
2024-05-011个回答
精彩回答
英语翻译But beyond that,it is a place of millions of friendly pe
2024-04-303个回答
2024-04-306个回答
2024-04-304个回答
2024-04-302个回答
下列说法中正确的是( )A. 物体在发生物态变化时都要吸热B. 热量总是自发地从高温物体传给低温物体C. 物质的比热容
2024-04-302个回答