Ionization Energy in Electron Volts

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Homework Help Overview

The problem involves calculating the energy required to ionize all hydrogen atoms in one mole of molecular hydrogen (H2), given that it takes approximately 10 eV to ionize a single hydrogen atom. The conversion between electron volts and joules, as well as Avogadro's constant, is relevant to the discussion.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need for an equation that incorporates Avogadro's number and explore the relationship between energy in electron volts and joules.

Discussion Status

The discussion is ongoing, with participants questioning the number of hydrogen molecules in a mole and considering the energy calculations. Some guidance has been offered, but there is no explicit consensus on the approach to take.

Contextual Notes

Participants are grappling with the basic concepts of ionization energy and the conversion factors needed for the calculation. There is an acknowledgment of potential confusion regarding the number of atoms in a mole and the energy required for ionization.

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Homework Statement



(10.) It requires roughly 10 eV to ionize one hydrogen atom. How much energy (in joules) are needed to ionize all the hydrogen atoms in one mole of molecular hydrogen (H2)? [Recall: 1 eV = 1.6 × 10−19 J and Avogadro’s constant is about 6 × 1023.]


Homework Equations



I don't know what equation to use that would include Avogadro's number...this is probably very elementary, I apologize.

The Attempt at a Solution

 
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Don't look for some equation. Think it out.
 
2 atoms;
(1.6 × 10−19 J) x 20? that simple?
 
How many hydrogen molecules in a mole?
 
Ahhhh.

(A's# x 2 H molecules)(20 eV)(1.6x10^-19)
 

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