(answered on edge) Calculate the percent by mass of each element.

%N = 35 %

%H = 5.0 %

%O = 60 %

N=35%. so 35/100*7 =2.45%

H=5.0 so 5/100*1=0.05%

o=60% so 60/100*8=4.8%

C) heat travels from the hotter object to the cooler object.

Explanation:

Conduction is a method of transferring heat on two objects that collide with each other. There are other types of heat transfer methods such as convection and radiation. Contact is mandatory to make conduction happen. The heat will travels from the object with higher energy(hotter) to lower energy (cooler).  Heat won't travel from cooler objects to the hotter object.