3K + AlCl3 --------> 3 KCl + Al
element compound compound element
This is single replacement (displacement) reaction.
Answer:
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Answer:
K+ ion is identical to argon and the Br- ion is identical to krypton
Explanation:
Potassium atoms have 19 electrons, when they become an ion they lose an electron and now have 18 electrons. The noble gas that has 18 electrons is Argon. Bromine atoms have 35 electrons, when they become an ion they gain an electron and now have 36 electrons. The noble gas that has 36 electrons is Krypton.
<u>Given:</u>
Enthalpy change ΔH for the thermite reaction = -850 kJ
Moles of Al involved = 4
<u>To determine:</u>
Reaction enthalpy when 4 moles of Al reacts
<u>Explanation:</u>
The thermite reaction is-
2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)
When 2 moles of Al react the enthalpy change is -850 kJ
therefore, when 4 moles of Al reacts, the change in enthalpy is-
= 4 moles * (-850) kJ/2 moles = -1700 kJ
Ans: Enthalpy change is -1700 kJ