Q40 of 203 Page 129

What is the significance of the formula of a substance?

With the help of molecular formula of a compound, we can calculate its percentage composition by mass. First, we calculate the molecular mass of the compound. From this we can find out mass of one mole of the compound, which is equal to its gram molecular mass.


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What is the difference between 2H and H2?

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What do the following denote?

(i) N (ii) 2N (iii) N2 (iv) 2N2

 41

What is the significance of the formula H2O?

 42

The molecular formula of glucose is C6H12O6. Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)