Question

Calculate the molarity of a solution containing 30.0 g of
ethanol (C2H5OH) in 6.00 L of solution.

What is the molarity of a solution containing 2.00 g of NaOH in
1000 mL of solution?

How many grams of sodium carbonate (Na2CO3) are needed to prepare
2.50 L of a 0.15 M solution?

How many grams of KOH are needed to prepare 100 mL of a 0.50 M
solution?

Lab 9 Worksheet: Concentration of Solutions (Ch4) Name:

How many mL of a 14.0 M stock solution must be used to make 250 mL
of a 1.75 M solution?

You have 200 mL of 6.0 M HF. What concentration results if this is
diluted to a total volume of 1 L?

100 mL of 6.00 M CuSO4 must be diluted to what final volume so that
the resulting solution is 1.50 M?

Water is added to 4.0 L of 6.0 M antifreeze until it is1.5 M. What
is the total volume in L and mL) of the new solution?

If we have 1 L of 3.0 M HCl, what is the molarity of the solution
if the acid is diluted to a volume of 6.0 L?

Answer #1

Molarity = moles of solute/Vol of solution in L

Ans.1

Mass of ethanol = 30g

Molar mass = 48.07g/mol

Moles = mass/molar mass = 30g/48.07g/mol = 0.624

Vol =6L

Molarity = 0.624mols/6L = 0.104M

Ans.2:

Mass of NaOH = 2g

Molar mass = 39.99g/mol

Moles = 2g/39.99g/mol = 0.05mol

Vol = 1000ml = 1L

Molarity = 0.05mol/1L = 0.05M

Ans.3:

Volume = 2.50L

Molarity = 0.15M

Molarity= moles/Volume in L

Moles = Molarity * Volume

Moles = 0.15*2.50 = 0.375mols

Molar mass of Na2CO3 = 105.98g/mol

Moles = mass/molar mass

So,mass of Na2CO3 = moles* molar mass =0.375moles*105.98g/mol =39.74g

MAss of Na2CO3 = 39.74g

Ans.4:

Molarity = 0.5M

Volume = 100ml = 0.1L

Moles = molarity*vol = 0.5*0.1 = 0.05moles

Molar mass of KOH = 56.11g/mol

Mass of KOH = moles* molar mass =0.05mol*56.11g/mol = 2.81g

Mass of KOH= 2.81g

1.
Vodka is advertised to be 80 proof, which is 40% by volume of
ethanol, C2H5OH. Assuming the density of the solution is 1.0 g/mL
and the density of ethanol is 0.789 g/mL. If the solution is at
25oC, what is the vapor pressure of water over the solution?
2. Calculate the molarity and molality of a solution of 50
grams of ethanol, C2H5OH (density = 0.789 g/mL) which is dissolved
in 200 mL of water (density = 1.00 g/mL).

What is the molarity of a solution that contains 0.978 grams of
H3PO4 in 60.0 mL of solution? What is the new molarity of the H3PO4
solution if the original solution is diluted by a factor of 3? How
many mL of the diluted solution could be completely neutralized by
12.5 mL of 0.545 M NaOH?

34.76 g of methane reacts in a container with 23.4 g of oxygen
and 12.3 g of carbon dioxide are produced. Which reactant
is limiting? What is the theoretical yield of
carbon dioxide? What is the percent yield of
carbon dioxide?
CH4 + O2 ⟶CO2 + H2O
Identify the strongest intermolecular force
present in each of the species:
a.) CH4
b.) HF
c.) H
d.) CHCl3
List ALL of the intermolecular forces present
in...

a.) What is the molarity of a solution prepared by dissolving
47.1 grams of Ca(OH)2 in a total solution volume of 400.0 mL?
b.) What volume of the solution in part (a) is required to
prepare 5.00 L of 0.100 M Ca(OH)2?
c.) The dilute solution in part (b) is used in a titration
experiment to neutralize 35.00 mL of an HClO solution. 24.48mL of
0.100 M Ca(OH)2 are required to fully neutralize the hypochlorous
acid. Give the balanced chemical...

Calculate the molarity of a solution made by adding 150.0 mL of
water to 85.00 mL of a 0.157 M solution.
How many milliliters of a 0.180 M KCl solution are needed to
provide 0.0306 mol KCl?
If the red dye #40 concentration is 3.00×10-3 M in
the original syrup, what is its concentration in dilution #3 (enter
your answer in the box below the image)? The red dye #40 syrup is
diluted by a factor of 2 three times....

1b. Calculate the exact molarity of a solution of NaOH if 55.00
mL of it is needed to titrate an amount of KHP that equals your
average mass (that you stated above). Average is 50.0 (4 pts)
2a. What is the average molarity for your standardized NaOH
solution?_______________ (1 pt) Average: .0075 M
2b. If 1.20 grams of impure solid KHP sample required 2.53 mL of
your standardized NaOH to reach the end point, what was the percent
KHP in...

Calculate the molality of a 6.55 M ethanol
(C2H5OH) solution whose density is 0.9245
g/mL.

What is the molarity of an aqueous solution containing 36.0
grams of fructose (C6H12O6) in 50.0 mL of solution? (C = 12.01 amu,
H = 1.01 amu, O = 16.00 amu)
To make sure you are doing this one correct, determine all of
the following:
mols = Blank 1 mols
L = Blank 2 L
M = Blank 3 M

Mellissa dissolves 26. grams of NaF with water to make a 199. mL
solution. What is the molarity of the solution? There are 1,000 mL
in 1 L.
Tamara has 107 g of a NaCl solution that has
concentration of 4.5 % NaCl (m/m). How many grams of NaCl are
dissolved in that solution?

What mass of ethanol, C2H5OH a
nonelectrolyte, must be added to 10.0 L of water to give a solution
that freezes at -10.0°C? Assume the density of water is 1.0 g/mL.
Kf of water is 1.86°C/m.
2.48 kg
85.7 kg
1.17 kg
24.8 kg
5.38 kg

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