# Chemistry

posted by _Unknown

Help me set them up and then check my answers?

Round your answer to the correct number of significant digits and show work.

1. How many grams of NaI would be used to produce a 2.0 M solution with a volume of 10.00 L?

2. What is the molarity of a 2.50 x 102 cm3 solution containing 450.0 g of C6H12O6 ?

3. How many moles of Sr(NO3)2 would be used in the preparation of 20.50 L of a 30.5 M solution?

1. DrBob222

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.
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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