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Question

QUESTION 1
Imagine a solution composed of 31.5 g of NaCl dissolved in 500 mL of H 2O. What is the molarity of the solution? Report your answer to 3 significant figures

Answer 1

These are the steps to answering the question:

 

(1) Look up the molecular weight of NaCl in grams per mole, or look up the atomic weights of Na and Cl and add them to get the molecular weight of NaCl.

 

(2) Divide the mass of NaCl (31.5 g) by the molecular weight of NaCl.  That gives the number of moles of NaCl.

 

(3) Divide the number of moles of NaCl by the volume in liters (500 ml = 0.500 L).  That gives the molarity in moles per liter.

 

You take it from here.