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Calculate density A graduated cylinder

  1. May 12, 2009 #1
    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
     
  2. jcsd
  3. May 13, 2009 #2
    Re: chem

    is there a method to solving this?

    I don't know how to get the displaced volume /
     
  4. May 13, 2009 #3
    Re: chem

    You really should have posted your question https://www.physicsforums.com/forumdisplay.php?f=157" in the Homework Forum, but that's alright.

    Take a look at this site: http://www.chemicalforums.com/index.php?topic=33483.0

    If you still have questions, make sure you show how you got to your answer (the more work you show the easier it is to help).
     
    Last edited by a moderator: Apr 24, 2017
  5. May 13, 2009 #4

    Integral

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Re: chem

    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?
     
  6. May 14, 2009 #5

    Borek

    User Avatar

    Staff: Mentor

    Re: chem

    These are two separate experiments, both start with empty cylinder.
     
  7. May 14, 2009 #6
    Re: chem

    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
     
  8. May 15, 2009 #7

    Borek

    User Avatar

    Staff: Mentor

    Re: chem

    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.
     
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