3 years ago

The term “3 FeCI 2” in a balanced equation says

Chemistry

1 answer:

irinina [24]3 years ago

4 0

Answer:

Extracytoplasmic-Function Sigma Factor of Escherichia coli

Explanation:

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The mass of piece of sterling silver jewelry is 33.24 g. It contains 92.5% silver Ag by mass. Since, sterling silver is an alloy of Ag-Cu thus, percentage of Cu will be:

% Cu=100-92.5=7.5%

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$n=\frac{m}{M}$

Here, m is mass and M is molar mass.

Putting the values,

$n=\frac{2.493 g}{63.546 g/mol}=0.03923 mol$

Now, in 1 mole of Cu there are $6.303\times 10^{23}atoms$ thus, in 0.03923 mol, number of Cu atoms will be:

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Thus, number of atoms of Cu will be $2.363\times 10^{22} atoms$ .

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