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#### geissingert

##### New member

- Jan 28, 2013

- 1

Hoping you can give input. I need you to show work and explain. Here is what we have:

1. A gold coin has a mass of 9.25 grams. What is its volume if the density of gold is 19300 kg/m3?

v= m/d

v= m 9.25 g/d 19300kg/m3

Not sure how and what to do....please help

2. A helium filled balloon has a volume of 4.5 m3. What mass of helium does it hold if the density of helium is 1.8x 10-4 g/cm3?

v=4.5 m3

d=1.8x10-4g/cm3

m=dxv

m= 1.8x10-4g/cm3x4.5m3

100cm/1m

m3/m=m2

100cm/1mx100cm/1mx100cm/1m

1000000

m=1.8x10-4 gx4.5 x100x100x100

1.8 x100x100x100

1.000008

180 x 4.5= 810

m=810 (My answer, is this correct?)

1. A gold coin has a mass of 9.25 grams. What is its volume if the density of gold is 19300 kg/m3?

v= m/d

v= m 9.25 g/d 19300kg/m3

Not sure how and what to do....please help

2. A helium filled balloon has a volume of 4.5 m3. What mass of helium does it hold if the density of helium is 1.8x 10-4 g/cm3?

v=4.5 m3

d=1.8x10-4g/cm3

m=dxv

m= 1.8x10-4g/cm3x4.5m3

100cm/1m

m3/m=m2

100cm/1mx100cm/1mx100cm/1m

1000000

m=1.8x10-4 gx4.5 x100x100x100

1.8 x100x100x100

1.000008

180 x 4.5= 810

m=810 (My answer, is this correct?)

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