Question

1) The mole fraction of sodium phosphate, Na3PO4, in an aqueous solution is 5.62×10-2 . The percent by mass of sodium phosphate in the solution is %.

2)An aqueous solution is **36.0** % by mass
**hydrochloric acid**, **HCl**, and has a
density of **1.18** g/mL.

The mole fraction of **hydrochloric acid** in the
solution is

.

Answer #1

An aqueous solution of hydrochloric acid contains 36% HCl by
mass. Calculate the mole fraction of HCl in the solution.

1. The mole fraction of an aqueous solution of lithium sulfate
is 0.297. Calculate the molarity (in mol/L) of the lithium sulfate
solution, if the density of the solution is 1.39 g mL-1.
2. Determine the mole fraction of potassium permanganate in a
6.65 M aqueous solution of potassium permanganate. The density of
the solution is 1.39 g mL-1.

What is the concentration in mole fraction of solute of a 1.25M
aqueous solution of potassium nitrate, KNO3? The density of the
solution is 1.19 g/mL.

1. An aqueous solution of barium hydroxide is standardized by
titration with a 0.197 M solution of hydrobromic acid. If 10.4 mL
of base are required to neutralize 22.7 mL of the acid, what is the
molarity of the barium hydroxide solution? M barium hydroxide
b.An aqueous solution of hydrochloric acid is
standardized by titration with a 0.176 M solution
of barium hydroxide.
If 13.7 mL of base are required to neutralize
14.1 mL of the acid, what is the...

Calculate the molality, molarity, and mole fraction of FeCl3 in
a 23.0 mass % aqueous solution (d = 1.230 g/mL). molality=____m
molarity=____M mole fraction=___

A solution consists of 18.0 g of
hydrochloric acid, HCl, and
91.0 g water and has a density of
1.08 g/mL.
(a)Calculate the weight percent of HCl, (b) the
molality of HCl, (C) the mole fraction of
HCl, and (d) the molarity of HCl
in the solution.

4. Calculate the mole fraction of phosphoric acid (H3PO4) in a
25.4% (by mass) aqueous solution. (Assume 500 mL of solution.)
Please show work

A. You wish to prepare 198 grams of 10.3 %
Na3PO4. How many grams will need of sodium
phosphate and how many mL of water? Assume that the density of
water is 1.00 g / ml.
B. If 20.5 grams of an aqueous solution of cobalt(II) sulfate,
CoSO4, contains 2.84 grams of cobalt(II) sulfate, what
is the percentage by mass of cobalt(II) sulfate in the
solution?
C. An aqueous solution of lead nitrate,
Pb(NO3)2, contains 8.74 grams of lead nitrate...

A scientist wants to make a solution of tribasic sodium
phosphate, Na3PO4 , for a laboratory experiment. How many grams of
Na3PO4 will be needed to produce 675 mL of a solution that has a
concentration of Na+ ions of 0.800 M ?
Express your answer to three significant figures and include the
appropriate units

A scientist wants to make a solution of tribasic sodium
phosphate, Na3PO4, for a laboratory experiment. How many grams of
Na3PO4 will be needed to produce 638 mL of a solution that has a
concentration of Na+ ions of 0.603 M ?
Enter a numerical answer only, in terms of grams.

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