for those who know something about chemistry...?

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2wickze4

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question
How many grams of hydrogen chloride are in 50 ml of concentrated 12M HCl solution?


HCl = Hydrogen Chloride
12M = 12 Molarity
 
use the formula for molarity: M=mol/L

so it would be 12= x/0.05

solve for x. x= 0.6 mol

now you need to convert mols to grams you can do that by looking up hydrogen and chlorine's atomic masses on the periodic table. chlorine is 35 and hydrogen is 1. so their total would be 36.

use this equation: mol HCl x g HCl/mol HCl. the point is that you want to cancel words.

so your equation would be 0.6 mol HCl x 36 g HCl/1 mol HCl. The HCls cancel, leaving you with 21.6 grams of HCl as your final answer.
 
12 moles in 1 dm3(1000 cm3) so how many moles in 50cm3?
answer= 12*50/1000=0.6 moles

mass=0.6* 36.5(molar mass of HCl)=21.9g
 
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