document.write( "Question 1145505: Analysis shows that 20.0ml of concentrated hydrochloric acid of density 1.18g/ml contains 8.36g HCl. (A) find the mass of HCl per milimeter of acid solution. (B) find the percent by weight (mass) of HCl in the concentrated acid
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Algebra.Com's Answer #766741 by ikleyn(52798) $\"\"$ $\"About$

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document.write( "(A) To answer (A), divide the mass of 8.36 grams of HCl by 20 mL \r\n" );
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document.write( "      = 0.418 g of HCl per milliliter of acid solution.\r\n" );
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document.write( "(B)  Question (B) is formulated unclear in the post. It does not says explicitly, to which mass to relate 8.36 g of HCl.\r\n" );
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document.write( "     But from the context, there is only ONE such a mass: it is the total mass of the solution (20 mL * 1.18 g/mL).\r\n" );
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document.write( "     So, from the context the reader should guess it.\r\n" );
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document.write( "     Thus, to answer (B), divide the given mass of 8.36 grams of HCl by the total mass of the acid solution, which is (20 mL * 1.18 g/mL).\r\n" );
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document.write( "     Then multiply by 100% to get percentage :\r\n" );
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document.write( "         the percent by weight (mass) of HCl in the concentrated hydrochloric acid =   = 35.42% (approximately).\r\n" );
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