grade 11 chemistry math question help plz?

Question

the question is to find the width of a piece of 10 by 10 cm aluminum foil. the foil weighs 0.4 g. the teacher gave a hint by saying it has something to do with the density of the foil, which is given on the periodic table.

any help plz?

Answer 1

density = mass / volume

You can calculate the volume of the foil.

volume = mass / density

once you know volume of the aluminum, then you can calulate the thickness

Volume = L x W x thinkness

Just make sure all the units are the same

Answer 2

You should know this.
Density = Weight / Volume
You know the weight.
You can look up the density (about 2.5 g/cm^3)
You can find the volume in cc
You can divide the volume by the foil area to get the thickness.
So what's the problem?

Answer 3

I won't do your homework for you. But I will point you in the right direction.
Density is mass divided by volume.
Your mass is 0.4 g.
Volume would be 10 x 10 x X, where X is width.
The density of aluminum is: 2.70 g/cm3
Your equation would be:
0.4 / (10 x 10 x X) = 2.70
I'm sure you're capable of a little algebra to solve for X (it's units will be cm).

Answer 4

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Answer 5

I think you mean the thickness.

The formula is D = M /V

You have the mass of 0.4 g. The density is not in the periodic table, but you can easily look it up. Make sure you have it as g / cm3. You already have the area of 100 cm2. All you have to do is solve for the thickness