Question

E. A student used a carbon pencil to write
his homework. The mass of this was
found to be 5 mg. With the help of this
calculate
B. the number of carbon atoms in 12 mg of his home work writing
​

Answer 1

1)  The number of moles of carbon is

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

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:

Hence, the number of moles of carbon is  

2)