Asked by Anonymous
                How many grams of HCl are needed in order to make 0.500 liters of a 0.100 M HCl solution?
1.82 g
18.2 g
0.500 g
            
        1.82 g
18.2 g
0.500 g
Answers
                    Answered by
            Damon
            
    In a liter you have  .1 mol of HCl
.1 * (35.5 + 1) = 3.65 grams/liter
so in half a liter you have 1.825 grams of HCl
    
.1 * (35.5 + 1) = 3.65 grams/liter
so in half a liter you have 1.825 grams of HCl
                    Answered by
            DrBob222
            
    There is nothing wrong with Damon's response but I do these slightly differently. Chemistry thinks in mols. So we ask ourselves "How many mols do I need?" That's
mols = M x L = 0.1 x 0.500 = 0.05
Then mols = grams/molar mass
0.05 = g/36.5 and solve for g = 36.5 x 0.05 = 1.825. If your chem prof is picky about significant figures s/he will tell you that's too many and you should round that number to 1.82.
    
mols = M x L = 0.1 x 0.500 = 0.05
Then mols = grams/molar mass
0.05 = g/36.5 and solve for g = 36.5 x 0.05 = 1.825. If your chem prof is picky about significant figures s/he will tell you that's too many and you should round that number to 1.82.
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