The first and second ionisation enthalpies of a metal are and , respectively. How many moles of HCl and , respectively, will be needed to react completely with mole of the metal hydroxide?

Question

The first and second ionisation enthalpies of a metal are  and , respectively. How many moles of HCl and , respectively, will be needed to react completely with  mole of the metal hydroxide?

Canvas Classes · Accepted Answer

Strategy:
 Use the large gap between the first and second ionization enthalpies to determine the metal's valency. Then, use the stoichiometry of the neutralization reactions to find the required moles of each acid.

Step 1: Determine the valency of the metal
The first ionization enthalpy () is , and the second () is . The massive jump (nearly 10x) indicates that the second electron is being removed from a stable noble gas configuration. This metal belongs to Group 1 (e.g., Na) and forms a monova

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