# Question #3e721

##### 1 Answer

#### Explanation:

You know that chalcopyrite is **by mass**, which essentially means that **every**

That is what *percent concentration by mass* tells you. That

So, you know that you get **for every**

You can use the ore's percent concentration by mass as a **conversion factor** to help you calculate the mass of ore that would contain that many grams of copper

#321.5 color(red)(cancel(color(black)("g Cu"))) * "100 g ore"/(34.63color(red)(cancel(color(black)("g Cu")))) = color(green)(bar(ul(|color(white)(a/a)color(black)("928.4 g ore")color(white)(a/a)|)))#

The answer is rounded to four **sig figs**.