(a) Calculate the mass of 0.5 mole of sulphuric acid. Atomic mass (H = 1 u, S = 32 u, O = 16 u). (b) Find the number of atoms in 12 g of carbon. (c) How many atoms are present in (i) H2S molecule (ii) PO4 3- ions. (d) Write the names of elements present


#1

(a) Calculate the mass of 0.5 mole of sulphuric acid.
Atomic mass (H = 1 u, S = 32 u, O = 16 u).
(b) Find the number of atoms in 12 g of carbon.
© How many atoms are present in (i) H2S molecule (ii) PO4 3- ions.
(d) Write the names of elements present in (i) quicklime (ii) hydrogen bromide.


#2

(a) 1 mole of H2SO4 = 98
1/2 mole of H2SO4=49 g

(b) 6.23 x 10^23 atoms

© In H2S molecules, number of atoms=3
In P043- ion, number of atoms=5

(d) (i) Elements in quicklime (CaO)-Calcium, oxygen.
(ii) Elements in hydrogen bromide (HBr) - hydrogen, bromine.