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Determining mass of solute in a volume of solution
How many grams of solute are
in 2.4 mL of a .02 M H_{2}O_{2
}solution?

Step 1

Write out the definition for
molarity. M = moles solute/ liters of solution

Step 2

Identify the quantities
given in the
question
volume of
solution

moles of
solute

molarity

molar
mass

2.4
mL

?
unknown

.02 M
H_{2}O_{2}

1 mol = 34 g
H_{2}O_{2}


Step 3

Use the definition of
molarity to cancel out volume and determine the grams of
solute.
grams solute = [liters of solution] [molarity] [ molar mass of solute]
g solute
= 1.6 x 10^{3} g
H_{2}O_{2}

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Dr. Walt Volland,
all rights reserved revised April 2, 2005