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3. Atoms and Moleculers
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Q41 of 203 Page 129

What is the significance of the formula H2O?

Significance of formula H2O-

(i) It helps in the


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39

What do the following denote?

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

40

What is the significance of the formula of a substance?

42

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

43

Calculate the molecular masses of the following:

(a) Hydrogen, H2


(b) Oxygen, O2


(c) Chlorine, Cl2


(d) Ammonia, NH3


(e) Carbon dioxide, CO2


(Atomic masses: H = 1 u; O = 16 u; Cl = 35.5 u; N = 14 u; C = 12 u)

Questions · 203
3. Atoms and Moleculers
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