20. The density of copper is 8.94 g per cubic centimeter. Express the density of copper in kilograms per cubic centimeter. What is the density in kilograms per liter? (Hint: 1 cubic centimeter has a volume of 1 millimeter.)

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1. We start with the density of copper given as  
   $$
   8.94 \text{ g/cm}^3.
   $$

2. To convert the density from grams to kilograms, recall that  
   $$
   1 \text{ g} = 10^{-3} \text{ kg}.
   $$  
   Therefore, the density in kilograms per cubic centimeter is  
   $$
   8.94 \text{ g/cm}^3 \times 10^{-3} \text{ kg/g} = 8.94 \times 10^{-3} \text{ kg/cm}^3.
   $$

3. Next, we convert this density to kilograms per liter. Knowing that  
   $$
   1 \text{ liter} = 1000 \text{ cm}^3,
   $$  
   the density in kilograms per liter is obtained by multiplying by 1000:  
   $$
   8.94 \times 10^{-3} \text{ kg/cm}^3 \times 1000 \text{ cm}^3/\text{liter} = 8.94 \text{ kg/liter}.
   $$

Thus, the density of copper is $$8.94 \times 10^{-3}$$ kg per cubic centimeter and $$8.94$$ kg per liter.
The density of copper is 0.00894 kg per cubic centimeter and 8.94 kg per liter.

20. The density of copper is 8.94 g per cubic centimeter. Express the density of copper in kilograms per cubic centimeter. What is the density in kilograms per liter? (Hint: 1 cubic centimeter has a volume of 1 millimeter.)

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