Chemistry prob question density/mass/volume?

Question

I asked this question and did not get enough info to solve the problem. I am not asking for anyone to solve this ..but could I please have some order on how to set this problem up? This has had me stumped for the past week..any help would be greatly appreciated!

A certain paint has a density of 0.914 g/mL. You need to cover a wall that is 7.6 meters long and 2.74 meters wide with a layer of paint that is 0.13 mm thick. What volume of paint (in liters and gallons) is required? What is the mass (in grams and pounds) of the paint layer?

thanks!

Answer 1

First part... calculate the amount of paint needed. Volume of a rectangle is LxWxH. All three variables are given in the problem (dimensions of the wall and thickness of the paint layer). Remember to put all the variables in the same terms (thickness is in millimeters and wall dimensions are in meters).

Second part... now that you know the volume, calculate the mass using the density given. Again make sure that you convert your volume to mL, then multiply that number by .914.

Answer 2

Think this way, the area that you have to paint is, 7.6m*2.74m
If the thickness of the paint coat is 0.13mm (=0.13/1000m) think of the wall as a box, 7.6m long, 2.74m wide and 0.13 mm deep; then the volume of that box is = 7.6m*2.74m*0.00013m
= 0.00270712 Cubic m

Now take the paint:
When you say its density is 0.914g/ml that means 1 ml of the paint weighs 0.914g.
Remeber that 1ml=1cubic cm
and 1000 litres =1 cubic m
(100 *100*100 cm = 1 cubic m)

We found that the volume of paint needed is, 0.00270712 Cubic m
ie; 0.00270712 *1000 = 2.70712 litres

Therefore the volume of paint required is 2.70712 litres

If 1ml of the paint weighs 0.914 g
1 ltr will weigh 0.914 * 1000 = 914 g

since you will need 2.70712 litres to paint the wall, the weight of the paint will be,
914*2.70712 = 2474.30768 g = 2.474 kg

Hope you understood !!

Answer 3

First you need to obtain the volume of paint needed; convert all the dimensions of the wall and thickness of paint to cm, since the density units, g/mL can also be written g/cm3 . (1 ml=1 cm3)

Then multiply them to get the volume V.
Since D=M/V, then M = DV
Multiply density g/cm3 times volume in cm3.
Units cancel to give g (grams)
Convert g to lb. using equality 454 g=1 lb. (approx. factor)

Answer 4

First calculate the volume of paint from

V = length x height x thickness.

(Hint: be careful of the units that you use)

Now you can determine the mass of paint in grams.

To convert grams to lbs, there are 28.3 grams in an ounce.

If you need more help, either re post or email me.

I hope this helps.

Answer 5

Volume of paint is height x width x length :

V= a x b x c
= 2,74 x 7,6 x 0,00013
( 0,13 mm =0,00013 m,all units should be same)

= 0,002707 m3 = 2,707 dm3 = 2,707 ltrs

mass = density x volume

2,707 =

m= 2,707 x 0,914 = 2,4741 kgs = 2474,1 grms

Answer 6

hmmm... If I were to choose, I will go for double major in Biology and Chemistry. If there's a double major for Biology and Biochemistry - better. You don't need indepth Inorganic Chemistry and Physical Chemistry if you want immunology/infectious diseases/genetics. You would want Zoology, Molecular Biology, Microbiology, Biochemistry, Genetics, and Biotechnology courses.

Answer 7

Density = mass / volume

Answer 8

vloume of paint * density of paint will give you mass of the paint required.