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Solved: How many total moles of ions are released when

ISBN: 9780073511085 71

Solution for problem 13P Chapter 4

Principles of General Chemistry | 2nd Edition

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Principles of General Chemistry | 2nd Edition

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Problem 13P

How many total moles of ions are released when each of the following samples dissolves completely in water?

(a) 0.734 mol of $$\mathrm{Na}_{2} \mathrm{HPO}_{4}$$

(b) 3.86 g of $$\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$$

(c) $$8.66 \times 10^{20}$$ formula units of $$\mathrm{NiCl}_{2}$$

Step-by-Step Solution:

Step 1 of 3

Here we have to calculate how many total moles of ions are released when each of the following samples dissolves completely in water.

(a)

1st we will write a chemical equation for the dissociation of .

From the above reaction it has been found that 3 moles of ions are released when one mole of  dissolves, so the total number of moles released can be calculated as,

0.734 mol   3 mol ions / mol  = 1.47 mol of ions  ions

0.734 moles of  is also present.

Thus total mole of ion = 1.47 + 0.734 = 2.202 mol

Thus 2.202 moles of ions are released when  samples dissolves completely in water.

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Step 2 of 3

Step 3 of 3

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