Homework Help: chemistry

Posted by lauren on Tuesday, December 18, 2012 at 7:53pm.

A sample of 6.65 grams of NaOH is dissolved
into 621 mL of aqueous 0.250 M NaOH (as-
sume no volume change). This solution is
then poured into 2.16 gallons of water. (You
may assume that the two volumes can be
added.) What is the concentration of NaOH
in the final solution?
Answer in units of M

chemistry - DrBob222, Tuesday, December 18, 2012 at 8:14pm
2.16 gallons = ? L. Make that conversion; 1 gallon about 3.7854 L.

mols solid NaOH = grams/molar mass = ?
mols liquid NaOH = M x L = ?
M final soln = total mols/total L.

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