How many significant figures should be present in the answer of the following calculations?
a. `(0.02856xx298.15xx0.112)/0.5785`
b. `5xx5.364`
c. `0.0125+0.7864+0.0215`

Explanation

(i) `(0.02856 xx 298.15 xx 0.112)/0.5785`
3 significant figures
The number of significant figures, in 0.112 (least number of significant figures) is 3, therefore, the result should have 3 significant figures.
(ii) `5 xx 5.364 =4` significant figures.
5.364 has four significant figures (leaving the exact
(iii) 0.0125 + 0.7864 + 0.0215 = 4 significant figures The result is to be reported upto four decimal places as:
0.8204 it has 4 significant figures.