1.) How much ethanol, C2H5OH, in liters (d=0.789g/ml) must be dissolved in water to produce 190.5 of 1.65 M C2H5OH? (Molarity problem.)
190.5 WHAT for crying out loud?barrels, freight cars, lakes, I will assume you meant mL. If not that, adjust values below to what you should have written.
M = moles/L and moles = grams/molar mass.
1.65M = moles/0.1905. Calculate moles.
moles = gram/molar mass.
You know moles and molar mass, calculate grams.
From the density, calculate volume of ethanol to use and convert to liters.
2)work out the similar steps for the HCL.
2.) How much concentrated hydrochloric acid solution (36.0% HCl by mass, d = 1.18g/mL}), in milliliters, is required to produce 11.0 L of 0.296 M HCl?
First calculate the molarity of the concentrated HCl.
1.18 g/mL x 1000 mL - mass of 1 L = 1180 g.
How much of that is HCl? 36% so,
1180 x 0.36 = 424.8 g HCl.
How many moles is that?
424.8/36.5 = 11.6 M
Now use the dilution formula to determine what you want to prepare.
mL x M = mL x M
Check my work. I estimated the molar masses and rounded here and there so you need to go through the problem yourself and do those numbers right.
The second one is correct. Regarding the first one though, I calculated the grams to 6.8 g of C2H5OH. I don't quite understand the next step (regarding the density, etc)
that was me who posted the comment above. my friend had the same question.
I don't know how you obtained 6.8 g.
The part about the density:
The problem asks for VOLUME of ethanol to add to make ?? soln of ??M.
mass = volume x density
You calculate mass from above, substitute density here of 0.789, and solve for volume (in mL). Then convert to L. Look at your math. I don't get 6.18 grams (more like 15 g or so--in round numbers).
Answer this Question
chemistry - How much concentrated hydrochloric acid solution 36% HCL by mass d=1...
chemistry - How much ethanol C2H50H in liters d = 0.789g/ml must be dissolved in...
Chemistry - How much ethanol C2H50H in liters d=0.789g/ml must be dissolved in ...
CHEMISTRY - An ethanol-water solution is prepared by dissolving 10.00 ml ethanol...
chemistry - What is the percent by volume (% v/v) of a solution made by mixing ...
chemistry - Calculate the volume ( mL ) of the solute C2H5OH and the mass ( g ) ...
Chemistry #11 - A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml...
Chemistry - How much concentrated solution would you take to prepare 2.80L of 0....
Chemistry - A 11.7 m solution of the solute C2H5OH dissolved in the solvent ...
chem - The equilibrium constant Kc equals 5.90 for the reaction CH3COOH + C2H5OH...