Sig Figs

[Soonwoo Chung 1D]

In certain questions, there is no given data, but you can find it by looking at the table (for example, the enthalpies of formation). Would I just use the numbers I get from the table to determine the sig figs?

[Alexa_Kwang_1D]

I would because sometimes numbers in tables are approximations or are not the most precise so you need to account for that.

[Grace_Bower_2B]

If those are the only data points you are given, yes. Otherwise use the least precise measurement not counting measurements that have to be made in whole numbers.

[Jaz_Y_1H]

If there are no measured values in the question, do we assume to round to the nearest hundredth? For example, in Chapter 9 problem 21 part b, it says to calculate the entropy of a solid nanostructure made of 64 molecules in which the molecules lie in any one of four orientations with the same energy. The solutions manual gives the answer in 3 sig figs ( Ans= 1.22x10^-21 J/K) I am curious to know if we are expected to round to the nearest hundredth in cases like this.
Thank you in advance.