A sheet of gold weighing 11.5 g and at a temperature of 18.7°C is placed flat on a sheet of iron weighing 21.7 g and at a temperature of 58.2°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings.

Iknow the answer is a but i don't know why

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed