Question

A student used a carbon pencil to write his homework the mass of this was found to 5mg with the help of this calculate
1 The number of moles of carbon in his homework writing .​

Answer 1

According to the scientific calculations we came to know that almost 12 grams (approximately) of carbon is equals to one mole of carbon.

And according to the data mentioned in the question;

Carbon used = 5 mg.

Now;

12 g = 1 Mole

12000 mg = 1 Mole

1 mg = 1/12000 Mole

5 mg = 5/12000 Mole = 0.000416 Mole (answer)

Answer 2

The number of moles of carbon in his homework writing is $4\times 10^{-4}$  

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP, weighs equal to the molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass = 5 mg = 0.005 g

Molar mass = 12 g/mol

$\text{Number of moles of carbon}=\frac{0.005g}{12g/mol}=4\times 10^{-4}moles$

Learn More

Avogadro's law

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