Question

I need help with these to see if they are right

Answer 1

ok so 8. is 15 because of sig figs in expression
9. 25nm = 25*10^-9m or 2.5*10^-8m
10. density=mass/volume so volume=mass/density = 3.85*10^7
11. 0.65g/cm^3
12. 245mL
13.7.13g/cm^3
14.1mL

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