chem about acids and alkalis

1. Ammonia and hydrogen gas react even there is no water .

I don't think Ammonia and hydrogen gas can have any reaction.What can be formed ?

NH3 + H2 ---> ?

Do you mean hydrogen chloride (HCl) ?

2013-10-05 01:02:09 補充：
Ammonium chloride is a thermal dissociate substance.

under heating

HN4Cl(s) --> NH3(g) + HCl(g)

then the HCl(g) reacts with CaO(s)

2013-10-05 01:04:22 補充：
neutralization is acid + base --> salt + water

NH4Cl is a salt, not an acid.

NH3 is not a salt.

This reaction is not a neutralization reaction.

2013-10-05 01:10:17 補充：
Question 2.

Since there are only a few sentence. the whole idea is not clear.

If it refers to strong acid + alkaline and

weak acid + alkaline

If the number of mole of strong acid and weak acid are the same. (suppose both are mono basic).

2013-10-05 01:11:06 補充：
The number of mole of alkaline that required to react with both acids completely are the same.

2013-10-05 01:14:57 補充：
Question 3

barium oxide (BaO) is soluble. Ba2+ will not form ppt. with alkaline.

2013-10-05 01:18:28 補充：
In Question 2

If (solution B) is a weak acid, ...... used to react (with A) cannot be predicted.

It is hard to figure out what does it say.

2013-10-06 23:22:56 補充：
Sorry,沒有看見你後來的補充 :

NH3(g) + HCl(g) -> NH4Cl(s) there are no hydrogen or hydroxide ions in the reaction mixture, so is this neutralization?

There is no water on the product side. It is not a neutralization.

2013-10-06 23:25:01 補充：
'then the HCl(g) reacts with CaO(s) '
they can react in absence of water?

Yes. they can

carbon burns in oxygen is also a gas react with a solid.

It is possible.