What is the question that needs an answer?
The unit used to measure weighted average atomic mass is he dalton or amu. So A. Hope this helped :D
Answer:
B. exothermic; leaving
Explanation:
The exothermic process releases heat, which causes the surrounding area to increase in temperature.
Your hand is releasing heat and makes the temperature of the ice cube increase, to where it melts.
Alkane have the empirical formula of c3h8