Question

A solution was prepared by dissolving 26.0 g of KCl in 225 g of water.

The composition of a solution can be expressed in several
different ways. Four of the most common concentration units are
defined as follows:. mass %=mass of
componenttotal mass of solution×100%; mole fraction (*X*)=moles of
componenttotal moles of solution; molarity (*M*)=moles of
soluteliters of solution; molality (*m*)=moles of
solutemass of solvent (kg)

**Part A**

Calculate the mass percent of KCl in the solution.

**Part B**

Calculate the mole fraction of the ionic species KCl in the solution.

**Part C**

Calculate the molarity of KCl in the solution if the total volume of the solution is 239 mL.

**Part D**

Calculate the molality of KCl in the solution.

Answer #1

± Introduction to Units of Concentration
The composition of a solution can be expressed in several different
ways. Four of the most common concentration units are defined as
follows:.
mass %=mass of componenttotal mass of solution×100%
mole fraction (X)=moles of componenttotal moles of
solution
molarity (M)=moles of soluteliters of solution
molality (m)=moles of solutemass of solvent (kg)
A solution was prepared by dissolving 33.0 g of KCl in 225 g of
water.
Part A
Calculate the mass percent of KCl...

A solution is prepared by dissolving 20.2 mL of methanol in
100.0 mL of water. The final volume of this solution is 118ml. The
densities of methanol and water are 0.782 g/mL and 1.00 g/mL,
respectively. For this solution, calculate the following-
molarity
molality
mass %
MOLE FRACTION
VOLUME OF SOLVENT
MASS OF SOLVENT
MOLES OF SOLVENT
VOLUME OF SOLUTE
MOLES OF SOLUTE
MASS OF SOLUTE
VOLUME OF SOLUTION
MASS OF SOLUTION

A)
A solution is prepared by dissolving 50.4 g sucrose (C12H22O11) in
0.332 kg of water. The final volume of the solution is 355 mL. For
this solution, calculate the molarity. Express the molarity
in units of moles per liter to three significant
figures.
B)
Calculate the molality. Express the molality in units of
moles per kilogram of solvent to three significant
figures.
C)
Calculate the percent by mass.Express the percent by
mass to three significant figures.
D)
Calculate the...

A
solution was prepared by dissolving 155.0g of 245 g of water.
Calculate the mole fraction of KCl(the formula weight of KCl is
74.6 g/mol. The formula weight of water is 18.0g/mol). Express the
mole fraction of KClto two decimal places.

A solution is prepared by dissolving 20.2 mL of methanol (CH3OH)
in 100.0 mL of water at 25 ∘C. The final volume of the solution is
118 mL. The densities of methanol and water at this temperature are
0.782 g/mL and 1.00 g/mL, respectively. For this solution,
calculate each of the following.
A. Molarity
B. Molality
C. Percent by Mass
D. Mole fraction

KCl is an ionic salt with a formula
weight of 74.54 g/mole.
A 1.417 M (mole/liter) KCl solution
has a density of 1064.5 grams/liter at 20 OC.
Use the Molarity and the formula
weight to find the mass (g) of salt in one liter.
Then, find the mass (g and kg) of
water in one liter of the solution.
Determine the molality (m), or moles
of salt per kg of water, by dividing the moles of salt in one liter...

A solution is prepared by dissolving 29.0 g of glucose (C6H12O6)
in 360 g of water. The final volume of the solution is 382 mL . For
this solution, calculate each of the following.
A. Mole Fraction
B. Mole Percent

Part A Calculate the molarity of a solution prepared by
dissolving 12.9 g of Na2CrO4 in enough water to produce a solution
with a volume of 670. mL .
Express the molarity to three significant digits
Part B
How many moles of KBr are present in 160. mL of a 0.127 M
solution?
Express the amount in moles to three significant digits
Part C
How many milliliters of 6.7 M HCl solution are needed to obtain
0.19 mol of HCl?...

A solution is prepared by dissolving 61.5 mL of methanol in
115.0 mL of water at 25 ∘C . The final volume of the solution is
173.4 mL . The densities of methanol and water at this temperature
are 0.782 g/mL and 1.00 g/mL , respectively. For this solution,
calculate each of the following. [Molarity, molality, mass
percent]

A solution is prepared by mixing 25 mL pentane (C5H12, d = 0.63
g/cm3) with 30 mL hexane (C6H14, d = 0.66 g/cm3). Assuming that the
volumes add on mixing, calculate the mass percent, mole fraction,
molality, and molarity of the pentane.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 16 minutes ago

asked 31 minutes ago

asked 34 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago