Question

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

Answer 1

Answer: The number of moles of carbon is $4.166\times 10^{-4}mol$

Explanation:

To calculate the number of moles, we use the equation:

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

Given mass of carbon = 5 mg = 0.005 g   (Conversion factor: 1g = 1000 mg)

Molar mass of carbon = 12 g/mol

Putting values in above equation, we get:

$\text{Moles of carbon}=\frac{0.005g}{12g/mol}=4.166\times 10^{-4}mol$

Hence, the number of moles of carbon is $4.166\times 10^{-4}mol$

Answer 2

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