Question

At 20°C, a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL. What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

A) 2.55 m

B) 0.0449 m

C) 2.32 m

D) 0.446 m

E) 12.00 m

Answer #1

An aqueous solution is 8.00% ammonium chloride, NH4Cl, by mass.
The density of the solution is 1.023 g/mL. What are the molality,
mole fraction, and molarity of NH4Cl in the solution?

Solution C is made by mixing 58.7 mL of 0.16 M ammonium chloride
(NH4Cl) with 60.1 mL of 0.26 M ammonia solution. pKa
(NH4+) = 9.24
a. Calculate the pH of Solution C.
b. Calculate the pH of the buffer Solution C if 0.12 g of NaOH
(molar mass = 40.0 g/mol) is added (assuming no change in
volume).

What is the molality of a 2.46 M aqueous solution of CH3OH?
(Density = 0.976 g/mL)

An aqueous solution is 5.50% by mass
ammonia, NH3, and has
a density of 0.975 g/mL.
The molality of ammonia in the solution is _______
m

A dilute aqueous solution has a density of 0.9992474 g/mL at
14°C and a density of 0.9965162 g/mL at 27°C. a) Calculate the
percentage expansion in volume when the solution is heated from 14°
to 27°C. (b) If the solution has a measured concentration of 0.4559
M at 14°C, what will its concentration be at 27°C?

What is the molality of a 6.0 M aqueous solution of HI that has
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1. Your supervisor asks you to prepare 250.00 mL of ammonium
buffer solution (0.15 M) with pH=9.00, from a concentrated ammonia
solution (25%w/w, d=0.91g/cm3) and solid ammonium chloride (98%
w/w). (MW of NH3 = 17.03 g/mol and FW of NH4Cl = 53.5 g/mol and
pKaNH4+/NH3 =9.24).
a) How many milliliters of the concentrated ammonia solution do
you need?
b) How many grams of ammonium chloride do you need?

1. The density at 20 ∘C of a 0.258 m solution of glucose in
water is 1.0173 g/mL, and the molar mass of glucose is 180.2 g/mol.
What is the molarity of the solution?
2. Household bleach is a 3.0 mass % aqueous solution of sodium
hypochlorite, NaOCl.
3.
A. What is the molality of the bleach? (Express your answer
using two significant figures.)
B. What is the mole fraction of NaOCl in the bleach? (Express
your answer using two...

What is the molality of a 2.04 M KBr aqueous solution?The
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An aqueous solution of ammonium sulfate is prepared by
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water. The density of the solution is 1.73 g
mL-1.
a) Determine the mass percent of ammonium sulfate in the
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b)Determine the mole fraction of ammonium sulfate in the
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