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### Topic: density  (Read 2899 times)

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#### danny411

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##### density
« on: May 12, 2009, 01:15:02 AM »
forgot how to do these:

A graduated cylinder, when filled to the 40.00 mL mark with water (density 1.00g/mL)
and capped with a stopper, had a mass of 352.05 grams. The same cylinder had a rock of mass
37.40 grams placed into it and was re-filled to the 40.00 mL mark with water. The same cylinder
when stoppered (with the same stopper) now had a mass of 383.95 grams. What is the density of
the rock

mass of rock =37.40

volume= h20 40.00 ml + x

volume of rock= dont know

#### DrCMS

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##### Re: density
« Reply #1 on: May 12, 2009, 10:42:10 AM »
Measuring cylinder + 40ml of water = 352.05g
Measuring cylinder + 37.4g of rock + water to 40ml = 383.95g

What is the mass of water in the 2nd measurment?
What is the volume of water in the 2nd measurment?
If the total volume is still 40ml what is the volume of the rock?

Now you have a mass and volume for the rock the density can be calculated.