stoichiometry

Alright so I have a quiz on stoichiometry tomorrow and I am completely lost.. I would really appreciate some help. Thanks

Here are the problems:

How many moles of sodium will react with water to produce 4.0 mol of hydrogen in the following reaction
____Na(s)+____H20(l)--->____NaOH(aq)+____H2(g)

Known:
Unknown: What type of problem is this? mole to mole??

How many grams of lithium chloride will be formed by the reaction of chlorine with 0.046 mol of lithium bromide in the following reaction.
2LiBr(aq)+ ____Cl2--->2LiCl(aq)+___Br2(l)
Known:
Unknown: What type of problem is this? Mass to mass ?

Phosphorus burns in air to produce a phosphorus oxide in the following reaction:
___P(s)+____O2(g)--->____P4O10(s)
Known:
Unknown: What type of problem is this? Mole to mass

If 0.489 mol of phosphorus burns, how many moles of oxygen are used?
Known:
Unknown: What type of problem is this? Mole to Mole?

Sodium carbonate reacts with nitric acid according to the following equation:
_____Na2CO3+_______HNO3---->_____NaNO3+_____CO2+_______H20
Known:
Unknown: What type of problem is this? Mass to mole?

I put what type of problem I thought it was but im not 100% sure so whats why I put the question marks.

Thanks!

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