I want to calculate the mass. How?

Question

Hello, I'm not American, so I don't know if you use inches or something like that.

The mass compactness of polyethylene is 0,94g/cm ³.

I must calculate the mass of a block polyethylene of 2dm ³.

Given: mass compactness = 0,94g/cm ³. , block polyethylene of 2dm ³

Asked: the mass of a block polyethylene of 2dm ³

Solution: …?

Answer 1

mass = density * volume

density of polyethylene  = 0.94g/cm ^3

volume of polyethylene  = 2dm ^3

                                   = 2[(10 ^ -1m) ^3]

                                   = 2(10 ^ -3m^3)

                                   = 2(10 ^ -3) [(10 ^2 cm) ^3]

                                   = 2(10 ^ -3) [(10 ^6 cm^3]

                                   = 2(10^3 cm^3)

mass of polyethylene= 0.94 * 2(10^3 cm^3)

                                    = 1880g

THE UNIT USE MUST BE THE SAME

THEREFORE, YOU SHOULD LOOKED CAREFULLY OF THE UNIT AND THE CONVERSION OF UNIT MUST BE DONE BEFORE THE CALCULATION.

Answer 2

I have never met the expression "mass compactness", but it seems to mean the same thing as density.

Density x volume = mass

Volume = 2 dm^3 = 2,000 cm^3

Notice how I have given you units that will cancel out to give you your answer in g. Take it from there.

Answer 3

Density  p or mass compactness is mass m over volume V

p=m/V

then

m= pV

Just don't forget to convert dm ³ into cm ³.

m = 0.94 g/cm ³ x 2dm ³  x 10³  ( using 10³  since 1 dm = 10 cm)

m=1880 g

PS. We the Americans use a lot of things like inches, feet and also centimeters.