Question

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. For example, if you are asked to add 14.3 g of copper, add between 13 g and 15 g. Which of the following sets include two samples with an equal density? Which all that apply below 15.4 g gold and 18.7 g silver 15.2 g copper and 50.0 g copper 20.2 g silver and 20.2 g copper 11.2 g gold and 14.9 g gold

Answer 1

Answer: The correct answer is 15.2 g copper and 50.0 g copper and 11.2 g gold and 14.9 g gold.

Explanation:

Density of an object is defined as the ratio of its mass and volume. The chemical equation representing density of an object is:  

$\text{Density of object}=\frac{\text{Mass of object}}{\text{Volume of object}}$

Density is considered as an intensive property. Intensive property is the property that does not depend on the amount of substance. It remains same.

The density of a particular substance remains the same.

For Example: Density of nickel will remain the same for 100 grams or 0.01 grams of nickel sample which is 8.908 g/mL

Hence, the correct answer is 15.2 g copper and 50.0 g copper and 11.2 g gold and 14.9 g gold.

Answer 2

Answer: Set with equal densities are:

15.2 g copper and 50.0 g copper ; 11.2 g gold and 14.9 g gold

Explanation:

Density is defined as mass of the substance present in unit volume of the substance.

$Density=\frac{Mass}{Volume}$

It is an intensive property which means that two different masses of same substance will have same value of density under same conditions.

So, from the given samples with equal density are:

• 15.2 g copper and 50.0 g copper will have the same value density.

• 11.2 g gold and 14.9 g gold will have the same value density.