Unit Conversion help with Chemistry (Probably easy to most of you)?

Hello everyone!!! New to chemistry and I’m having trouble with some conversion help (I know, I’m kinda dumb ): ).
Anyway, I’m not sure what I’m doing wrong. So please, may I get some help? Thanks!

I’ve made the link public on my google drive with the 3 problems I’m confused with.

https://drive.google.com/a/students.clark.edu/folderview?id=0Bx46YCIAmiYhU0tCUDFLZkF4eGM&usp=sharing

For #12, can you put it with the right amount of sig figs? I’m not really sure how to apply the sig fig rules with conversion so I’ll be glad to read any teaching and explanations. Thanks!

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