Which of the following elements in an alkali metal? A calcium
B magnesium
C mercury
D sodium

D sodium

I just learned this in my class today;)

D sodium

Explanation:

1. I think you chose the right answer, the equation has the states of the reactants and products. 2. I think you chose the right answer. 3. I think you also chose the right answer. Assuming that the Hrxn is written as kJ per mol CH4 4. Heat of solution is the enthalpy change associated with dissolving a solute in a solvent. I think the first choice is the right one. 5. I think you chose the right answer.