# Calculate density A graduated cylinder

forgot how to calculate density

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

37.4g/31.9ml

not sure if im doing volume correct

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is there a method to solving this?

I don't know how to get the displaced volume /

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Integral
Staff Emeritus
Gold Member

If you dropped a rock into a cylinder the water level would rise. Why do you have to, or what do you mean, by refill it?

Borek
Mentor

If you dropped a rock into a cylinder the water level would rise. Why do you have to, or what do you mean, by refill it?

If you dropped a rock into a cylinder the water level would rise. Why do you have to, or what do you mean, by refill it?

not sure ?

don't know how much

Borek
Mentor

You take an empty cylinder, you fill it with water to the 40 mL mark. You weight it. This is your first mass.

You take an empty cylinder, you put a rock in it, you fill it with water to the 40 mL mark. You weight it. This is your second mass.