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samanthagarcia16
01.09.2020 •
Chemistry
How many moles and numbers of ions of each type are present in the following aqueous solutions?
(a) 88 mL of 1.75 M magnesium chloride,
(b) 321 mL of a solution containing 0.22 g aluminum sulfate/L,
(c) 1.65 L of a solution containing 8.83×10218.83×1021 formula units of cesium nitrate per liter.
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Ответ:
a. 0.154 moles = 2.78x10²³ ions
b. 2.18x10⁻⁴ moles = 6.56x10²⁰ ions
c. 1.77x10²² ions = 0.0147 moles
Explanation:
The multiplication of volume of solution in liters times molarity gives the moles of solute.
a. Moles MgCl₂:
88mL = 0.088L * (1.75mol / L) = 0.154 moles MgCl₂
Uaing Avogadro's number:
0.154mol *(6.022x10²³ molecules / 1 mol) = 9.27x10²² molecules.
As 1 molecule of MgCl₂ contains 3 ions:
Ions = 2.78x10²³
b. Moles Al₂(SO₄)₃:
Aluminium sulfate has a molar mass of 324.15g/mol:
0.321L * (0.22g Al₂(SO₄)₃ / L) * (1mol / 324.15g) = 2.18x10⁻⁴ moles.
1 molecule contains 5 ions:
2.18x10⁻⁴ moles *(6.022x10²³ molecules / 1 mol) * 5 = 6.56x10²⁰ ions.
c. 8.83x10²¹ formula units of CsNO₃ = Number of molecules. Ions are:
8.83x10²¹ * 2 = 1.77x10²² ions
And moles are:
8.83x10²¹ Formula units * (1mol / 6.022x10²³) = 0.0147 moles
Ответ:
A) is the correct one:)