How many moles of copper are present in a sample of tennantite with a mass of 2370 grams

A sample of tennantite with mass of 2370 g contains 19.23 mol Cu.

You must make the following conversions:

Mass of tennantite → moles of tennantite → moles of Cu

Step 1. Calculate the moles of tennantite (Tn)

The ideal chemical formula of Tn is Cu_12As_4S_13.

Molar mass = (12*63.55 + 4*74.92 + 13*32.06) g/mol

= (762.60 + 299.68 + 416.78) g/mol = 1479.06 g/mol

Moles of Tn = 2370 g Tn * (1 mol Tn/1479.06 g Tn) = 1.60 24 mol Tn

Step 2. Calculate the moles of Cu

Moles of Cu = 1.6024 mol Tn * (12 mol Cu/1 mol Tn) = 19.23 mol Cu