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.. The number of moles of carbon in his homework writing.(Ans : 4.16 x 10-4)​

Answer 1

Answer:

The number of moles of carbon used in the homework = 4.16 × 10^-4

Explanation:

Mass of carbon used in the homework = 5 mg

                                                                = 5 × 10^-3 g

Atomic Mass of carbon = 12

Therefore moles of carbon used = weight in grams/Atomic Mass

                                                      = $5\times10^{-3}/12$

                                                     = 4.16 × 10^-4

Therefore, the number of moles of carbon used in the homework = 4.16 × 10^-4

Hope this answer is helpful.