How many significant figures are in the answer when you multiply 67.20 x 8.02? How many significant figures are in the answer when you divide 486.02 by 0.056?

How many significant figures are in the answer when you add 11.264 + 245.3?

6, 7 and 6 significant figures, respectively.

Explanation:

A.  67.20 x  8.02 = 538.944, has  6 significant figures  .

B. 486.02 x 0.056 = 27.21712, has 7 significant figures .

C. 11.264 + 245.3 =  256.564 = 6 significant figures.

For an endothermic reaction to occur, the change in entropy must be positive; on the other hand, the change in entropy must be negative for an exothermic reaction to occur.
moreover, the occurrence of endothermic reactions is favored when the temperature is increased, and the occurrence of exothermic reactions is favored when the temperature is reduced.
thus, the reaction may be made spontaneous  when an endothermic reaction has a positive change in entropy and the temperature is greatly increased.