How many moles of chromium iii nitrate are produced when chromium reacts with 0.85 moles of lead for nitrate to produce chromium three nitrate and lead

0.85 moles formula units of lead nitrate will produce 0.57 moles formula units of chromium (III) nitrate.

Typically, the oxidation state of Pb in lead nitrate tend to be +2. In other words, Pb in lead nitrate tends to exist as ions. The formula for a nitrate ion is . The charge on each of the nitrate ion is -1. The charge on the two ions should balance. As a result, each ion in lead nitrate would pair up with two ions. The formula for lead nitrate will be . Each formula unit of lead nitrate will contain one ion and two ions.

The "III" in the name "chromium (III) nitrate" is a Roman Numeral. It indicates that the oxidation state of Cr in chromium (III) nitrate is +3. The Cr in that compound will exist as . Similarly, each will pair up with three ions. The formula for chromium (III) nitrate will be . Each formula unit of chromium (III) nitrate will contain one ion and three ions.

0.85 moles formula units of lead nitrate will contain 0.85 × 2 = 1.7 moles of ions. Those nitrate ions will end up in 1.7 / 3 = 0.57 moles formula units of chromium (III) nitrate. As a result, the reaction will produce 0.57 moles formula units of chromium (III) nitrate.

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