I’m pretty sure it’s 150 joules
2K + 2H2O -----> 2KOH + H2
The question is telling you what are the reactants and products .
Answer:
A type of granite?
Explanation:
The photo is a bit hard to see, but I'm guessing, from its smooth edges and the streaky colours that its a type of granite?
Looks like the type of granite used on granite tabletops....
I might be wrong, it's just a guess!
Hope this helped in some way....
Bluey :)