Question

What is the molar mass of ammonium sulfate?

Answer 1

Approx. `130*g*mol^-1`.

Explanation:

How did I get such a number?

`{2xx14.01+8xx1.00794+32.06+4xx15.999}*g*mol^-1`.

What is the relationship of this expression to `(NH_4)_2SO_4`?

This is commonly used as an agricultural fertilizer. Why?