Question

To write a letter with a graphite pencil, 0.001 g of carbon is required. Number of moles of carbon atoms and the total number of carbon atoms used in writing
the letter are respectively
A. 3.02 x 10 and 6.023 x 1023
B. 1 and 3.02 X 1024
C. 8.33 x 10-and 5.02 x 1019
D. 5.02 x 1019 and 3.02 X 1024
options in picture are correct ​

Answer 1

Answer:

C

Explanation:

In the above question we are given the weight of carbon and we have to find the no. of moles . So, it can be easily found by using the formula:

No. of moles,

$n = \frac{given \: mass}{molar \: mass}$

Similarly , for finding no. of carbon atoms:

No. of moles,

$n = \frac{given \: number}{avagadro \: number}$