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QUESTION

# Chalcopyrite, the principal ore of copper (Cu), contains 34.63 percent Cu by mass. A particular sample of chalcopyrite contains 321.5g of copper. Determine the mass of the sample of chalcopyrite in units of grams ?

"928.4 g"

You know that chalcopyrite is 34.63% copper by mass, which essentially means that every "100 g" of chalcopyrite contain "34.63 g" of copper.

That is what by mass tells you. That % sign means that you're looking at "100 g" of a compound.

So, you know that you get "34.63 g" of copper for every "100 g" of chalcopyrite, and that the sample contains "321.5 g" of copper.

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 .