The mass of the snow flakes that accumulates in one hour is 15552 Kg.
We know that area is the product of the length and the breadth of the lawn. We have to first obtain the area of the lawn as;
Length = 20.0 feet
Width = 18.0 feet
Area = 20.0 feet * 18.0 feet = 360 square feet
If 1 square feet accumulates 450 new snowflakes every minute
360 square feet accumulates 360 square feet * 450 new snowflakes every minute/ 1 square feet
= 162000 new snowflakes every minute
If 162000 new snowflakes accumulates in one minute
x snow flakes accumulates in 60 minutes
x = 9720000new snowflakes
If 1 snow flake has a mass of 1.60 mg
9720000 new snowflakes has a mass of 9720000 snowflakes * 1.60mg/ 1 snow flake
= 15552000 mg or 15552 Kg
Learn more about Unit conversion:https://brainly.com/question/11543684
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