Why is it not possible to see an atom with naked eyes?
Firstly, atoms are miniscule in nature, measured in nanometers. Secondly, except for atoms of noble gasses, they do not exist independently. Hence, an atom cannot be visible to the naked eyes.
Calculate the number of aluminium ions present in 0.051g of aluminium oxide.
(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27u)
Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur.
What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?
Convert into mole.
(a) 12g of oxygen gas
(b) 20g of water
(c) 22g of carbon dioxide
What is the mass of -
(a) 1 mole of nitrogen atoms?
(b) 4 moles of aluminium atoms((Atomic mass of aluminium =27)?
(c) 10 moles of sodium sulphite (Na2SO3)?