how much 后面为何有个of

But the striking thing about the company is how much of a chance it has of achieving such unprecedented goals.

请问：how much 是做状语修饰 has 吗？为何后面有个 of？

为何不可以写成：how much it has a chance of achieving such unprecedented goals.？

But the striking thing about the company is how much of a chance it has of achieving such unprecedented goals.

先看一个陈述句:

The company has 80% of a chance of achieving such unprecedented goals.

然后就划线部分提问：

How much of a chance does the company have of achieving such unprecedented goals?

再将这个特殊疑问句改为名词性的表语从句，就得到你提问中的句子。of achieving可以改为不定式。

But the striking thing about the company ishow much of a chance it has toachieve such unprecedented goals.