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?
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.
Calculate the formula unit
masses of ZnO, Na2O, K2CO3,
given atomic masses of Zn = 65 u,
Na = 23 u, K = 39 u, C = 12 u,
and O = 16 u.
How many atoms are present in a
(i) H2S molecule and
(ii) PO43– ion?
compounds represented by the_________
Write down the names of following formulae:
(i) Al2(SO4)3
(ii) CaCl2
(iii) K2SO4
(iv) KNO3
(v) CaCO3
Write down the formulae of
(i) sodium oxide
(ii) aluminium chloride
(iii) sodium sulphide
(iv) magnesium hydroxide
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