Problem: Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water.  Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.A) 13.9 M      B) 12.8  M      C) 10.7 M      D) 9.35 M      E) 7.79 M

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We’re being asked to calculate the molarity (M) of hydrochloric acid (HCl) in a solution. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). In other words:



We first need to determine the number of moles of HCl. We’re given the mass percent of HCl in water, 39.0%. Recall that mass percent is given by:



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Problem Details

Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water.  Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.

A) 13.9 M      

B) 12.8  M      

C) 10.7 M      

D) 9.35 M      

E) 7.79 M

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