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3 years ago

How many moles of zinc are there in 0.890 g of zinc?

Chemistry

2 answers:

NNADVOKAT [17]3 years ago

4 0

Answer:

There are

4.517

⋅

atoms of Zn in 0.750 mols of Zn.

Explanation:

Since we know that there are

6.022

⋅

atoms in every mole of a substance (Avogadro's Number), there are

6.022

⋅

0.750

atoms of Zn in 0.750 mols of Zn.

tino4ka555 [31]3 years ago

4 0

Answer:

There are 4.517 ⋅ 10 23 atoms of Zn in 0.750 mols of Zn. have a good day:)

Explanation:

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svlad2 [7]

Explanation:

Given the mass of HCl is ---- 0.50 g

The volume of solution is --- 4.0 L

To determine the pH of the resulting solution, follow the below-shown procedure:

1. Calculate the number of moles of HCl given by using the formula:

$number of moles of a substance=\frac{given mass of the substance}{its molecular mass}$

2. Calculate the molarity of HCl.

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$pH=-log[H^+]$

Since HCl is a strong acid, it undergoes complete ionization when dissolved in water.

$HCl(aq)->H^+(aq)+Cl^-(aq)$

Thus, $[HCl]=[H^+]$

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$number of moles of a substance=\frac{given mass of the substance}{its molecular mass}\\=0.50g/36.5g/mol\\=0.0137mol$

2. Concentration of HCl:

$Molarity of HCl=\frac{number of moles of HCl}{its molar mass}\\=\frac{0.0137 mol}{4.0 L} \\= 0.003425 M$

3. pH of the solution:

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