Some Basic Concepts of Chemistry - Result Question 5

####22. The number of significant figures for the three numbers 161cm,0.161cm,0.0161cm are

(a) 3,4 and 5 respectively

(b) 3, 4 and 4 respectively

[1998]

(c) 3, 3 and 4 respectively

(d) 3, 3 and 3 respectively

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Solution:

22.4 L & 11.2 L & 0 & \text{ initial } \ =1 mole & =0.5 mole & & \ 1-0.5 & 0.5-0.5 & 2 \times 0.5 & \text{ final } \end{matrix} $

Moles of HCl formed =2×0.5=1



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