Density Calculations with Examples: Finding Density from Mass and Volume

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In summary, density is a measure of how much mass is contained in a given volume, usually expressed in units of grams per cubic centimeter (g/cm3) or kilograms per cubic meter (kg/m3). It is calculated by dividing the mass of an object by its volume using the formula D = m/V. Density is an important property of matter as it helps identify substances and provides information about their composition and purity. It can be measured using various techniques such as using a balance and a graduated cylinder. While density can change if the mass or volume of an object changes, the density of a substance remains constant regardless of its size or shape.
  • #1
faisal
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heres the questions and I'm asked to find the density
Q1.
Mass = 79.4 grams

Volume=29.8 cubic cm.
DENSITY = MASS/VOLUME therfor density= 2.6gcm3
QII.

Mass= 25.4 grams

Volume=29.8 cubic cm.
Density= 0.85gcm3
 
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  • #2
Answers look right however your units are notated incorrectly.

g/cm^3

or grams per cubic centimeters.
 
  • #3


In order to find the density, we need to use the formula: Density = Mass/Volume. Let's plug in the given values for Q1: Mass = 79.4 grams and Volume = 29.8 cubic cm. We can then calculate the density by dividing the mass by the volume: 79.4g/29.8cm3 = 2.6g/cm3. This means that for every 1 cubic centimeter of this substance, there is 2.6 grams of mass.

For QII, we are given the mass and volume but asked to find the density. Using the same formula, we can plug in the values for Mass = 25.4 grams and Volume = 29.8 cubic cm. When we divide 25.4g by 29.8cm3, we get a density of 0.85g/cm3. This means that for every 1 cubic centimeter of this substance, there is 0.85 grams of mass.

In both cases, we can see that the units for density are grams per cubic centimeter (g/cm3). This is a common unit for density, but other units such as kilograms per liter (kg/L) or pounds per cubic inch (lb/in3) can also be used. It is important to note that density is a characteristic property of a substance and can be used to identify different materials.
 

1. What is density?

Density is a measure of how much mass is contained in a given volume. It is usually expressed in units of grams per cubic centimeter (g/cm3) or kilograms per cubic meter (kg/m3).

2. How is density calculated?

Density is calculated by dividing the mass of an object by its volume. The formula for density is D = m/V, where D is density, m is mass, and V is volume.

3. Why is density an important property of matter?

Density is an important property of matter because it helps us identify and classify different substances. It can also provide information about the composition and purity of a substance.

4. How do you measure density?

Density can be measured using a variety of methods, depending on the size and type of object. Some common techniques include using a balance to measure mass and a graduated cylinder to measure volume.

5. Can density change?

Density can change if the mass or volume of an object changes. For example, if you squeeze a piece of clay, its volume decreases and its density increases. However, the density of a substance remains constant regardless of its size or shape.

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