here is an attached photo with a detailed explanation, good luck!
Answer:
3.18 mol
Explanation:

n(CO2) = mass/ Mr.
= 25.5 / 16
= 1.59 mol
As per the equation above,
n(LiOH) : n(CO2)
2 : 1
∴ 3.18 : 1.59
Answer:
the concentration of the reactants
the temperature in heating
It is not directly over a flame because it depends on the substance you might not want to heat it too much.you never know what could happen