Chemistry
A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
Related Questions
If phosphorus is considered to contain P4 molecules, then calculate the number of moles in 100 g of phosphorus?
Calculate:
(a) The gram molecular mass of chlorine if 308 cm3 of it at S.T.P. weighs 0.979 g.
(b) The volume of 4 g of H2 at 4 atmosphere.
(c) The mass of oxygen in 2.2 litres of CO2 at S.T.P.
An unknown gas shows a density of 3 g per litre at 273°C and 1140 mm Hg pressure. What is the gram molecular mass of this gas?
Correct the following:
(a) Equal volumes of any gas, under similar conditions, contain an equal number of atoms.
(b) 22 g of CO2, occupies 22.4 litres at STP.
(c) The unit of atomic weight is grams.