1. How many mols do you want? That's mols = M x L = ?
Then mols = g/molar mas. Substitute mols and molar mass and solve for grams. Then round to the right number of s.f.
Here is a site that will help you do that. http://www.chemteam.info/SigFigs/SigFigs.html
2. mols = grams/molar mass
Then M = mols/L solution. Round to correct number of s.f.
3. The reverse of #2.
Post your work if you get stuck.
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