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NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

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Question : 31
Total: 36
How many significant figures should be present in the answer of the following calculations?
(i)
0.02856×298.15×0.112
0.5785
(ii) 5 × 5.364
(iii) 0.0125 + 0.7864 + 0.0215
Solution:  
(i)
0.02856×298.15×0.112
0.5785
 =
0.9536983
0.5785
 = 1.6485711
Correct answer = 1.64
1.64 has 3 significant figures.
(ii) 5 × 5.364 = 26.82
26.82 has 4 significant figures.
(iii) 0.0125 + 0.7864 + 0.0215 = 0.8204
0.8204 has 4 significant figures.
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