chemistry
posted by aira .
how many significant figures do the following numbers have?
a. 1.2056 x 10^4 m:
b. 1 x 10^89 km:
c. 12,000 L:
d. 0.000345 cm:
e. 1.00036 mL:
f. 0.2056000 m:

a. 1.2056 x 10^4 m: ==> 5
b. 1 x 10^89 km: ==> 1
c. 12,000 L: ==>2 Trailing 0's are significant if no decimal is present.
d. 0.000345 cm: ==>3 Leading 0's are significant.
e. 1.00036 mL:
f. 0.2056000 m: ==> 7 
Excuse the other posts.
a. 1.2056 x 10^4 m: ==> 5
b. 1 x 10^89 km: ==> 1
c. 12,000 L: ==>2 Trailing 0's are not significant if no decimal is present.
d. 0.000345 cm: ==>3 Leading 0's are not significant.
e. 1.00036 mL: ==>6
f. 0.2056000 m: ==> 7 Trailing 0's are significant when a decimal is present.