Calculate density?????

Question

1) calculate density in kg/L of an object w/ mass of 28.461 kg and volume of 525,000mL

2) denisity of silver is 10.49 g/mL. if a sample of silver has vloume of 12.993 L what would it's mass be?

5.) how many grams of tin would occupy 5.5 mL, if its density is 7.265 g/ml

please show me how to do this, or try to show me as many as you can, thanks.

Answer 1

ok
density is a ratio of mass/volume

1. convert from mL to L by dividing by 1000 then divide the mass by the volume

2. convert the volume to mL and multiply the density and the volume

5. same as number 2

basically to do these problems all you need to do is convert units and multiply or divide as necessary to make the units right. if you have density and need mass, multiply density by volume
if you hae density and need volume divide mass by density
if you have mass and volume and need density divide mass by volume
if you have itchy red bumps in an embarrassing place, go see a doctor

Answer 2

Density can only be expressed as the ratio of a weight per volume.

Take note that a conversion factor can be constructed by setting two terms that are the same kind of unit (like weight) equal.

For example: 1kg=1000g, therefore 1kg/1000g=1000g/1kg

Now arrange this fraction so that the unit you want to get rid of cancels.

Work with it until you are familiar with the system. Learn this well. It is easy, but it doesn't go away. Your sucess in class will depend on your mastery of conversion methods!!

Answer 3

1.density=mass/volume
=>28.461/525 kg/l

2.mass=vol*density
=>10.49*12993 g

3.mass=vol*density
=>5.5*7.265 grams