Question

help with sig figs?

Answer 1

What exactly?

Answer 2

The reason for significant figures is to report answers that have a precision consistent with the original data or input values. This sounds complicated but for adding/subtracting or multiplying/dividing it is not too difficult to adjust your answer to the right number of "sig figs".

Answer 3

can you still help me

Answer 4

What are you being asked to do?

Answer 5

how many sig figs in my answer for..

Answer 6

0.100 mol NaOh * 21.29 mL * (1L/1000 mL) its in dimensional analysis

Answer 7

would it be 1 because of the 1000 ml or 3

Answer 8

do you mean 0.100 M NaOH?

Answer 9

yeah sorry

Answer 10

OK, when you do multiplication and/or division, the rule is to make your answer match the LEAST number of sig figs found in your given values.

Answer 11

so 1 sigfig

Answer 12

0.100 has 3 sig figs
21.29 has 4 sig figs

So your answer needs to have 3 sig figs. Got it?

Answer 13

but thats so inaccurate

Answer 14

but what about the 1/1000

Answer 15

1000 has 1 sigfig

Answer 16

Good point, but see if you can understand why -- 1 L is EXACTLY 1000 mL.

I could just as well say 1 L = 1000.000000000... you get the point?

Answer 17

1000 does have 1 sig fig, true.

Answer 18

ok

Answer 19

1000 has 1 because the only number that HAS to be there is the one digit.
for 0.100, those extra zeroes were added because there was extra precision.

Answer 20

can you help me with my chemistry homework

Answer 21

a problem or two, sure. General chemistry?

Answer 22

yep. for the reaction HCl + NaOH ===> H20 + NaCl

Answer 23

if the the molality of Naoh is 0.100 mol/ =L and the volume of Nacl is 21.29