D. Hemoglobin carries oxygen (it is the only one in this list that does.)
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
<em>Step 1</em>. Calculate the <em>moles of tennantite</em> (Tn)
The <em>ideal </em>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) = <em>1.60 24 mol Tn
</em>
<em>Step 2</em>. Calculate the <em>moles of Cu</em>
Moles of Cu = 1.6024 mol Tn × (12 mol Cu/1 mol Tn) = 19.23 mol Cu