<u>Answer:</u> Amount of iron produced is 101.36 grams.
<u>Explanation:</u>
For the reaction of aluminium and iron oxide, the equation follows:

By Stoichiometry of the reaction,
When 1 mole of aluminium oxide is produced, then 2 moles of iron is also produced.
So, when 0.905 moles of aluminium oxide is produced, then
of iron is also produced.
Now, to calculate the amount of iron produced, we use the equation:

Molar mass of iron = 56 g/mol
Moles of iron = 1.81 moles
Putting values in above equation, we get:

Hence, amount of iron produced is 101.36 grams.
Gravitational potential energy is the energy stored in an object relative to its position :)
Answer:
20703.6J
Explanation:
Quantity of heat (Q) = mass of dioxane × enthalpy of fusion
Mass of dioxane = 142g
Enthalpy of fusion of dioxane = 145.8J/g
Q = 142g × 145.8J/g = 20703.6J