Atoms And Molecules
Which of the following has maximum number of atoms?
A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced? What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer?
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)?
Give the names of the elements present in the following compounds.
(a) Quick lime
(b) Hydrogen bromide
(c) Baking bromide
(d) Potassium sulphate.