Question

how many sig figs in 4.6x10^19

Answer 1

I think:

2 sig fig for 233.356 is 230.000 (rounded up)

2 sig for 0.002353 is 0.0024 (rounded up). 0.002353 is definitely not the same number as 2.4!

And discount all the rest of the numbers.

Im not sure about the following: how many sig fig should each answer be rounded. But 4.6x10^-19 sounds good to me. Possibly 2.5x10^22. Rounding 11.8 makes 12, i guess report it as 12 (ones with 2 sig fig) or 12.0 (tenths dec place and this has 3 sig figs). Rounding 0.735 makes 0.74 so to the hundreths and has 2 sig fig.

Answer 2

2 sig figs.

scientific notation shows us how many sig figs are there.