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July 23, 2014

July 23, 2014

Posted by **Hannah** on Monday, August 23, 2010 at 4:34pm.

(a) 3.149 e3 to 3.2 e3

Its incorrect but I dont know the correct answer

(b) 7.999 102 to 80

same with this one

50.31 to 50.3

same with this one and I put 50.0 and it said check the number of sig figs

(d) 0.009914 to 0.010

this is incorrect but i dont know the correct one.

thanks:)

im not that good at sig figs:(

- Chemisty (Sig Figs) -
**bobpursley**, Monday, August 23, 2010 at 5:08pmThe issue you seem to have is not significant figures, but rounding rules.

You can fine rounding rules and examples on a Google search.

a) 3.149e9 rounds (to two sig figures) to 3.1e9

b) 7.999 102 to 80 rounds to 8.0e2

c) 50.31 to 50 or better 5.0e1. When one writes 50, it is difficult to know if the zero is significant, in general it is not. But with 5.0e1, the zero is certain.

d) 0.009914 to 0.0099 is two significant figures.

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