Question

how many signficant figures does the following number have? 0.000310

Answer 1

oi. sig figs. hate em.
http://www.usca.edu/chemistry/genchem/sigfig.htm <-- see this link for reference
i think it's three.

Answer 2

only 3.
Leading zeroes are never significant. the zeroes in front of "3" are leading zeroes
trailing zeroes are significant IF they follow a decimal point

Answer 3

only 3 because the leading zeros are never significant