2)0.001 g of C is required to write a letter with a graphite pencil. The total number of C atoms used in writing the letter is
5 x 1012
5 x 1019
5 x 1024
1 x 1020
Your Answer
Not Attempted
Correct Answer
b
please show me the calculation
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1 Answers
61The gram atomic mass of carbon =12 g
therefore,
12 g carbon = 6*10^23 atoms of Carbon
1 g carbon = (6*10^23)/12 atoms of carbon
.001 g carbon = [{(6*10^23)/12}*.001] atoms of carbon
= 5 * 10^19 atoms of carbon (answer)
which is option b)
