When the following equation is balanced, the coefficient of dinitrogen pentoxide is . 
Definitions:
Life Expectancy
The average age to which a person is expected to live based on demographic factors such as current age, gender, and health conditions.
Developed Nations
Countries that have a high level of economic development, advanced technological infrastructure, and higher standards of living among their populations.
Low Life Expectancy
A statistical measure indicating the average period an individual is expected to live, which is shorter than the typical lifespan due to various factors like disease, lifestyle, or environment.
Poverty
A condition where individuals or communities lack the financial resources and essentials for a minimum standard of living.
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Q128: Astatine decays by_.