1. Write the symbols of following elements.
(a) Cobalt CO
(b) Carbon c
(c) Aluminium AL
(d) Helium He
2. Calculate the molecular mass of the following:
(a) H2CO3
(b) C2H5OH
(C) MgSO4
3. What does the symbol ‘u’ represent?
4. Which postulate of Dalton’s Atomic theory is the basis of law of conservation of mass?
5. Chemical symbol of sodium is Na. What is its Latin name?
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Answer:
CoCO
C2
Al2
He2
....hanku
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