The volume of a rock is 29 ml. The mass of the rock is 5 grams. What is its density

d =  

m

V

m = d×V

V =  

m

d

DENSITY

Density is defined as mass per unit volume.

d =  

m

V

Example:

A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?

Step 1: Calculate the volume

V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³

Step 2: Calculate the density

d =  

m

V

=  

433

g

200

c

m

³

= 2.16 g/cm³

MASS

d =  

m

V

We can rearrange this to get the expression for the mass.

m = d×V

Example:

If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?

m = d×V = 500 mL ×  

1.11

g

1

m

L

= 555 g

VOLUME

d =  

m

V

We can rearrange this to get the expression for the volume.

V =  

m

d

Example:

What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.

Step 1: Convert kilograms to grams.

14.83 kg ×  

1000

g

1

k

g

= 14 830 g

Step 2: Calculate the volume.

V =  

m

d

= 14 830 g ×  

1

c

m

³

19.32

g

= 767.6 cm³

Explanation:

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation: