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A solution consists of 44.3 g of hydrochloric acid (HCl), 75.7 g water, and has a volume...

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Chemistry

A solution consists of 44.3 g ofhydrochloric acid (HCl),75.7 g water, and has a volume of101 mL.

Calculate the weight percent of HCl, the molalityof HCl, the mole fraction of HCl,and the molarity of HCl in the solution.

weight percent =%
molality =m
mole fraction =
molarity =

M

A solution of barium chloride(BaCl2) in water is5.000 % barium chloride by mass.Its density is 1.0434 g cm-3 at 20 °C.Compute its molarity, mole fraction, and molality at thistemperature.

Molarity BaCl2 =  

Mole fraction BaCl2 =

Molality BaCl2 =  

The EPA's secondary standards for contaminants that may causecosmetic or aesthetic effects in drinking water suggest an upperlimit of 5.00×10-2 mg/L formanganese . If1.40×104 liters of water in a storagetank contains 2.66 grams of Mn,what is the contaminant level in ppm? Is this level acceptablebased on EPA guidelines?

ppm   _________acceptable/not acceptable

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