How many grams of K2SO4 are needed to prepare 500. mL of a 0.375 M solution
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How many grams of K2SO4 are needed to prepare 500. mL of a 0.375 M solution

[From: ] [author: ] [Date: 12-04-04] [Hit: ]
(.375M)=mol/(.(.375M) x (.5 liters) = .now to convert the moles to grams you multiply by the moler mass of k2so4 which you get from the periodic table.......
Can you show the steps through dimensional analysis please? I don't understand how to do this at all!
(I used the formula for molarity: mol of solute/L solution)

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so molarity=mol of solute/L solution

you are given the molarity and they give you the volume in milliliters.

convert the ml to liters so you can use the molarity formula.

500ml/1000 = .5 liters.

now use the formula and you get the moles of k2so4

(.375M)=mol/(.5 liters)

(.375M) x (.5 liters) = .1875 mol k2so4

now to convert the moles to grams you multiply by the moler mass of k2so4 which you get from the periodic table.

k = 39.10 x2
s= 32.07
o= 16x4
+_______
(174.27 g/mol)

so (.1875mol) x 174.27g/mol)= 32.7 g k2so4
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