A flask contains 85.5 g #C_12H_22O_11# (sucrose) in 1.00 liters of solution. What is the molarity?

1 Answer
Nathan L.
Jul 16, 2017

#"molarity" = 0.250M#

Explanation:

We're asked to find the molar concentration (molarity) of a sucrose solution, given the volume of solution and mass of solute.

The equation for molarity is

#"molarity" = "mol solute"/"L soln"#

We're given the volume is #1.00# #"L"#, so we just need to find the moles of solute (we're given grams) via the molar mass of sucrose (#342.30# #"g/mol"#):

#85.5cancel("g sucrose")((1color(white)(l)"mol sucrose")/(342.30cancel("g sucrose"))) = color(red)(0.250# #color(red)("mol sucrose"#

Therefore, we have

#"molarity" = (color(red)(0.250color(white)(l)"mol sucrose"))/(1.00color(white)(l)"L soln") = color(blue)(0.250M#

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