Question

1. Newer copper pennies actually contain very little copper. A new penny is 97.3% zinc and 2.7% copper by mass. What is the density of a new penny if the density of pure copper is 8.95 g/ cm³ and pure zinc is 7.14 g/ cm³? 2. The French scientist Lavoisier prepared pure mercury by heating mercury (II) oxide, HgO, which chemically decomposes into liquid mercury metal and oxygen gas. After heating 4.32 g of mercury (II) oxide, 0.32 g of oxygen is produced. a) Determine the % mercury in the compound and the % oxygen. b) How much mercury (II) oxide would have to be heated to produce 10.0 g of mercury? Use dimensional analysis format; remember that %A = g A per 100 g sample.

          1. Newer copper pennies actually contain very little copper. A new penny is 97.3% zinc and 2.7% copper by mass. What is the density of a new penny if the density of pure copper is 8.95 g/ cm³ and pure zinc is 7.14 g/ cm³?

2. The French scientist Lavoisier prepared pure mercury by heating mercury (II) oxide, HgO, which chemically decomposes into liquid mercury metal and oxygen gas. After heating 4.32 g of mercury (II) oxide, 0.32 g of oxygen is produced.

a) Determine the % mercury in the compound and the % oxygen.
b) How much mercury (II) oxide would have to be heated to produce 10.0 g of mercury? Use dimensional analysis format; remember that %A = g A per 100 g sample.

1. Newer copper pennies actually contain very little copper. A new penny is 97.3% zinc and 2.7% copper by mass. What is the density of a new penny if the density of pure copper is 8.95 g/ cm³ and pure zinc is 7.14 g/ cm³?

2. The French scientist Lavoisier prepared pure mercury by heating mercury (II) oxide, HgO, which chemically decomposes into liquid mercury metal and oxygen gas. After heating 4.32 g of mercury (II) oxide, 0.32 g of oxygen is produced.

a) Determine the % mercury in the compound and the % oxygen.
b) How much mercury (II) oxide would have to be heated to produce 10.0 g of mercury? Use dimensional analysis format; remember that %A = g A per 100 g sample.

Added by Kimberly D.

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