Scientific notation is used to communicate the level of precision used to keep track of very small and very large numbers during mathematical calculations used to accurately measure volumes used to measure length with precision

used to keep track of very small and very large numbers during mathematical calculations

Explanation:

Scientific notation makes data easy to understand and manageable. It is used to express decimal numbers that are cumbersome to write. They simplify mathematical operations.  

For example a number such as 1877655600 can be conveniently expressed in scientific notation as 1.87 x 109. Similarly a number such as 0.000000789 can be conveniently expressed in scientific notation as 7.89 x 10-7.  

the correct answer is a

the maximum mass of nh3 is nh3 in grams