The hydrogen equivalent mass is 1.008 atomic mass units (amu).
Understanding Equivalent Mass
Equivalent mass, also known as gram equivalent weight, is a fundamental concept in chemistry. It refers to the mass of a substance that will combine with or displace a fixed amount of another substance. More specifically, it’s the mass of a substance that combines with or displaces 1.008 parts by mass of hydrogen, 8 parts by mass of oxygen, or 35.5 parts by mass of chlorine.
Equivalent Mass and Hydrogen
For hydrogen, the equivalent mass is relatively straightforward due to its simple chemical behavior. Hydrogen has an atomic weight of 1.008 amu and one valence electron.
Here's a breakdown:
- Atomic Weight: Hydrogen's atomic weight is approximately 1.008 amu.
- Valence Electrons: Hydrogen has one valence electron, which means it typically forms one bond.
- Equivalent Weight Calculation: The equivalent weight is calculated as the atomic weight divided by the valency (number of valence electrons)
- For hydrogen: equivalent weight = 1.008 amu/1 = 1.008 amu
In summary: The equivalent weight of hydrogen is equal to its atomic weight, which is 1.008 amu.
Gram Equivalent Weight
The gram equivalent weight is simply the equivalent weight expressed in grams. So, one gram equivalent of hydrogen is 1.008 grams. This concept helps in understanding the quantitative aspects of chemical reactions.
Practical Insights
- Simple Calculation: Because hydrogen has a valence of one, its equivalent weight is numerically equal to its atomic weight.
- Stoichiometry: Understanding the equivalent weight is crucial when determining the quantities of substances required for chemical reactions to occur.
- Redox Reactions: The concept is particularly useful in redox reactions where electrons are transferred.
| Parameter | Value for Hydrogen |
|---|---|
| Atomic Weight (amu) | 1.008 |
| Valence Electrons | 1 |
| Equivalent Mass (amu) | 1.008 |
| Gram Equivalent Weight (g) | 1.008 |
