Calculate the weight/mass of :

(a) an atom of oxygen

(b) an atom of hydrogen

(c) a molecule of NH₃

(d) 10²² atoms of carbon

(e) 0.25 gram atom of calcium

(a) What do you understand by the statement that 'vapour density of carbon dioxide is 22'?

(b) Atomic mass of Chlorine is 35.5. What is it's vapour density?

Calculate the number of gram atoms in 4.6 gram of sodium

Calculate the number of moles in 12 g of oxygen gas