Question

Gold has a density of 19.3 g/cm3. What is the mass of a 5 cm3 block of gold?
A. 3.9 grams
B. 19.3 grams
C. 38.6 grams
D. 96.5 grams

Answer 1

I HAVE NO CLUE............

Answer 2

mass = volume * density, You can even get that from the units. If density is 19.3 grams per cube centimeter that means that a block of 1 cm^3 has the mass of 19.3 grams. So, what is the mass of a block of 5 cm^3

Answer 3

Right. By definition
Mass of 1 cm^3 = Density

Here
Mass of 1 cm^3 = 19.3 g

Hence
mass of 2 cm^3 = 19.3 g + 19.3 g = 2*19.3 g

mass of 3 cm^3 = 3*19.3 g

etc.

Hence mass of 5 cm^3 = what?

Answer 4

125

Answer 5

No, how did you get that?

Answer 6

the 3 is cubed

Answer 7

1 cm^3 = 19.3 g
2 cm^3 = 2*19.3 g = (19.3 + 19.3) g
3 cm^3 = 3*19.3 g = (19.3 + 19.3 + 19.3) g
4 cm^3 = 4*19.3 g
5 cm^3 = ... what?

Answer 8

and you do that by 5

Answer 9

?? confusing

Answer 10

Imagine you have a little block of gold in front you. It's a cube. Each side 1 cm long. Then the volume of that cube is
V = (1 cm)^3
= 1^3 cm^3
= 1 cm^3.

That is, this a cube with volume of 1 cubic centimeter.

The density of gold is 19.3 g/cm^3. Hence that little cube of gold weight 19.3 g.

So far so good?

Answer 11

yeah

Answer 12

Now, suppose you have two identical such cubes in front you. What's the combined volume of those cubes?

Answer 13

Two identical cubes, each with a volume of 1 cm^3. What's the combined volume of the two cubes?

Answer 14

still there? talk to me or I'm moving on.