The first question is a limiting reagent problem. You work it the same way as the previous LR problem.
The second one is not a LR problem but a simple stoichiometry problem. So instead of converting two reactants to mols of product and choosing which one to use you have only the one reagent to worry with and there is no choice.
The idea with this homework help site is that we show you how to do one and you use that as a template to solve the other problems you have.
I shall be happy to explain further if you tell be exactly what you don't understand. You have the information to solve these two problems.
I've stuck with these two stoich questions
A mixture is prepared by adding 20 ml of 0.200 M Na3PO4 to 30 ml of 0.150 Ca(NO3)2. What weight of calcium phospate will be formed?
and last question would be, How many milliliters of 0.30 M NiCl2 solution are needed to react completely with 25 ml of 0.10 M Na2CO3 solution? How many grams of NICO3 will be formed?
Molarity = number of moles / Liters
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