Perform the following mathematical operations, and express each result to the correct number of significant figures.

(a) 0.25 x 6.022 x 10^23

(b) (4.0 x 10^4) x (5.620 x 10^-3) x (7.34993 x 10^2)

(c) (5.0 x 10^6) / 3.00 x 10^-7

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Perform the following mathematical operations, and express each result to the correct number of significant figures.

(a) 0.25 x 6.022 x 10^23

(b) (4.0 x 10^4) x (5.620 x 10^-3) x (7.34993 x 10^2)

(c) (5.0 x 10^6) / 3.00 x 10^-7

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## Answers (1)

(a) 0.25 x 6.022 x 10^23

0.25 = two sig figs

6.022 x 10^23 = four sig figs

answer should have 2 sig figs

0.25 x 6.022 x 10²³

= 1.5 x 10²³

c)

(5.0 x 10^6) = 2 sig fig

3.00 x 10^-7 = 3 sig fig

(5.0 x 10^6) / (3.00 x 10^-7)

= 1.7 x 10¹³