your answer is <u>D</u><u>.</u><u> </u>physical change, because a new substance is not formed.
<span>The vaporization of br2 from liquid to gas state requires 7.4 k/cal /mol.</span>
Answer: Avogrado's Constant
Explanation:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.
I think that you should use your phone
The corrects answer is 259 K
