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Damm [24]
3 years ago
5

Calculate the number of atoms of copper represented by 127.08 g of copper. 1. 1.20 × 1024 atoms 2. 2.00 atoms 3. 1.30 × 1024 ato

ms 4. 2.16 atoms
Chemistry
2 answers:
chubhunter [2.5K]3 years ago
7 0
Avagadros number states that 1 mol of any substance is made of 6.022 x 10²³ units. 
1 mol of Cu is made of 6.022 x 10²³ atoms of Cu.
the molar mass of Cu is - 63.5 g/mol 
63.5 g of Cu is made of 6.022 x 10²³ atoms of Cu
therefore 127.08 g of Cu contains - 6.022 x 10²³ atoms / 63.5 x 127.08 
number of Cu atoms - 1.20 x 10²⁴ atoms of Cu
answer is 1) 1.20 x 10²⁴ atoms
marshall27 [118]3 years ago
7 0

Answer : The number of atoms of copper are 1.20\times 10^{24}

Explanation :

First we have to calculate the moles of copper.

\text{Moles of }Cu=\frac{\text{Mass of }Cu}{\text{Molar mass of }Cu}

Mass of Cu = 127.08 g

Molar mass of Cu = 63.5 g/mole

\text{Moles of }Cu=\frac{127.08g}{63.5g/mole}=2.00mole

Now we have to calculate the number of atoms of copper.

As we know that, 1 mole of substance contains 6.022\times 10^{23} number of atoms.

As, 1 mole of copper contains 6.022\times 10^{23} number of copper atoms.

So, 2.00 mole of copper contains 2.00\times 6.022\times 10^{23}=1.20\times 10^{24} number of copper atoms.

Therefore, the number of atoms of copper are 1.20\times 10^{24}

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<em>T is absolute temperature in Kelvin (30°C + 273.15 = 303.15K)</em>

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