Ordinary ''lead'' pencils actually are made of a form of carbon called graphite. If a pencil line is `0.35 mm` wide and the diameter of a carbon atom is `1.5 xx 10^(-10)m`, how many `C` atom wide is the line?

How many atoms are in 4.0 xx 10^(-5) gams of Al?

A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interiro .The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm . If length of the pencil is 10 cm, find the voluem of the wood and that of the graphite.

Calculate the difference in the number of carbon atoms in 1.0 g of C-14 isotope and 1.0 g of C-12 isotope.

The pressure of sodium vapour in a 1.0 L container is 10 torr at 1000^(@)C . How many atoms are in the container?

The pressure of sodium vapour in a 1.0 L container is 10 torr at 1000^(@)C . How many atoms are in the container?

The pressure of sodium vapour in a 1.0 L container is 10 torr at 1000^(@)C . How many atoms are in the container?

A signature made by graphite pencil is of weight 2 xx 10^-3 g . Calculate the no. of carbon atoms in that signature.

The number of carbon atoms present in a signature , if a signature written by carbon pencil, weighing 1.2 xx 10^(-3) g is:

A led pencil consists of a cylindner of wood with a solid cylinder of graphite filled into it. the diameter of pencil is 7mm, the diameter of graphite is 1 mm and the length of the pencil is 10cm. Calculate the weight of the whole pencil, if the specific gravity of the wood is 0.7 (gm)/(cm)^3 and that of graphite is 2.1 (gm)/ (cm)^3