Question

The lead in lead pencils is pure carbon, C. The mass of a period mark is 0.00010 g. How many C atoms (C’s) make the period Mark?

HELP ASAP PLEASE!

Answer 1

The mass of one atom of Carbon is 2.0×10^−26 kg.

The mass of the period mark(kg)= 1.0x10^-7 kg.

# of carbon atoms=1x10^-7/2x10^-26

# of carbon atoms= 5x10^-34