The mass of water to fill the swimming pool of length 45 m, width 30 m and a depth of 72 ft is 
Further explanation:
Density is considered as a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by
.
The formula to calculate the density of water is,
…… (1)
The swimming pool is in the shape of a cuboid. Its length, width, and depth are 45 m, 30 m and 7.2 ft.
Firstly, we have to convert the depth of the pool from feet to meters. The conversion factor for this is,

So the depth of the pool is calculated as follows:

The formula to calculate the volume of the pool is as follows:
…… (2)
The length of the pool is 45 m.
The width of the pool is 30 m.
The depth of the pool is 2.19456 m.
Substitute these values in equation (2).

As the pool is filled with water so the volume of water is the same as that of the swimming pool and therefore the volume of water is
.
Rearrange equation (1) to calculate the mass of water.
……. (3)
The conversion factor to convert the volume of water in mL is as follows:

So the volume of water is calculated as follows:

The density of water is 1 g/mL.
The volume of water is
.
Substitute these values in equation (3).

So
water is needed to fill the swimming pool. Its value up to 3 significant figures is
and it is written as
in scientific notation.
Learn more:
1. Calculation of volume of gas: brainly.com/question/3636135
2. Determine how many moles of water produce: brainly.com/question/1405182
Answer details:
Grade: Middle School
Subject: Chemistry
Chapter: Density
Keywords: density, mass, volume, swimming pool, length, width, depth, water, volume of water, density of water, significant figures, scientific notation, 2.963E9, 2962656000 g.