Chemistry

O.k. I am confused. So here is what I did.

Mass of empty flask plus stopper: 37.34g
mass of stoppered flask plus water: 63.67g
Mass of stoppered flask plus liquid:
52.01g
Mass of water:
63.67 - 37.34= 26.33
Volume of Flask(density of H20 at 25*C, 0.9970 g/cm^3:
(37.34g)/(0.9970g/cm^3)=37.45cm^3
Mass of Liquid:
52.01g - 37.34g= 14.67g
Density of Liquid:
(14.67)/(0.9970)=14.72g/cm^3

That was part 1 (density of unknown Liquid) Here comes part 2 density of unknown metal.

Mass of stoppered Flask plus metal:
61.28g
Mass of stoppered Flask + Metal+ Water:
78.19g
Mass of metal:
61.28g - 37.34g= 23.94g
(Note that 37.34 is the mass of the stoppered Flask from before)
Mass of water:
78.19g - 61.28g=16.91g
Volume of water:
(16.91)/ (0.9970)=16.96cm^3
Volume of metal:
???????????
I did the following:
(23.94g)/(0.9970g/cm^3)= 24.01cm^3
then using this answer I need to caculate the Density of the Metal:
(23.94g)/(24.01cm^3)= 0.9970 g/cm^3

But why would the Density for water at 25*C, which was given, be the same as the density of the metal? Shouldn't it be different? So I came to the conclusion that in the end I must be doing something wrong because my answer is like walking around in circles...(The last two caculations), so I either don't really get the concept or I made a mistake from the get go...or I am using the wrong numbers, to calculate certain parts. so, this is were i need your help. I hope it's clearer whemn I show you exactly what I did.

  1. 👍 0
  2. 👎 0
  3. 👁 129
asked by Sara
  1. You are getting confused with the numbers.
    Go back to square 1.
    You were correct before that
    mass H2O = 26.33 g.
    mass liquid = 14.67 g.
    volume of H2O = 26.33/0.9970 = 26.409 cc = volume of the liquid.
    so density of liquid = mass/volume =14.67/26.409 = 0.55549 which rounds to 4 significant figures as 0.5555
    Your original error was in miscalculating the volume of the liquid. The volume of the liquid is the same as the volume of the water and the volume of water is the mass of water divided by the density of water to give the volume of water.

    1. 👍 0
    2. 👎 0
  2. Mass of empty flask plus stopper: 37.34g
    mass of stoppered flask plus water: 63.67g
    Mass of stoppered flask plus liquid:
    52.01g
    Mass of water:
    63.67 - 37.34= 26.33
    Volume of Flask(density of H20 at 25*C, 0.9970 g/cm^3:
    You are ok to here.

    (37.34g)/(0.9970g/cm^3)=37.45cm^3
    You have used the mass of the EMPTY flask. The volume of the flask is the grams H2O in the flask divided by the density of the water which is 26.33 (your figures from above)/0.9970 (the density of the water at the temperature at which the experiment was conducted) = 26.409 cc = volume of flask.

    Mass of Liquid:
    52.01g - 37.34g= 14.67g
    OK here

    Density of Liquid:
    (14.67)/(0.9970)=14.72g/cm^3
    No, the density of the liquid is the mass of the liquid (14.67 is correct) divided by the volume of the liquid. The volume of the liquid is the same as the volume of the water that was in the flask which is 26.409 cc. That's why you went through the whole process of determining the volume of the flask by weighing the water and using the density of water to calculate the volume of the water which also is the volume of the flask. So,
    density of liquid = 14.67/26.409 = 0.55549 g/cc which to 4 significant figures is 0.5555 g/cc.


    Let's get the first part straight before tackling the second part. I will let you see what you were doing incorrectly for the first part> then using that knowledge work through the density of the metal. Repost that part if you get stuck. Thanks for showing your work. It makes it easier to catch what is going wrong.

    That was part 1 (density of unknown Liquid) Here comes part 2 density of unknown metal.

    Mass of stoppered Flask plus metal:
    61.28g
    Mass of stoppered Flask + Metal+ Water:
    78.19g
    Mass of metal:
    61.28g - 37.34g= 23.94g
    (Note that 37.34 is the mass of the stoppered Flask from before)
    Mass of water:
    78.19g - 61.28g=16.91g
    Volume of water:
    (16.91)/ (0.9970)=16.96cm^3
    Volume of metal:
    ???????????
    I did the following:
    (23.94g)/(0.9970g/cm^3)= 24.01cm^3
    then using this answer I need to caculate the Density of the Metal:
    (23.94g)/(24.01cm^3)= 0.9970 g/cm^3

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    mass of empty flask with stopper = 32.634 g mass of flask with water and stopper = 59.479 g density of the water = 0.9973 g/cm^3 mass of water = 26.845 g volume of water = 26.918 cm^3 the flask is then emptied and an unknown

    asked by Vanessa on October 16, 2007
  2. Chemistry

    Mass of an empty flask and stopper is 55.844g. 5mL of an unknown liquid is added and heated in a water bath at 99.7 degrees C. It then cools down. The stopper is removed and then replaced. The weight of all of this is 56.101g. The

    asked by Gg on October 21, 2014
  3. chemistry

    mass of empty flask plus stopper 36.765 g mass of stoppered flask plus water 65.264 g Temperature 24.8 C calculate the volume? need help please

    asked by finny on September 6, 2016
  4. Chemistry

    The Densities of Liquids and solids O.k. so here is my problem. I will give you the whole problem just incase my mistake is somewhere else, but the volume for the metal and the density for the metal in the end seem to be wrong.

    asked by Sara on August 22, 2007
  5. Chemistry

    A student obtained a clean, dry glass- stoppered flask. She weighed the flask and stopper on an analytical balance and found the total mass to be 33.695 g. She then filled the flask with water and obtained a mass for the full

    asked by Alan Anderson on January 24, 2014
  6. chemistry

    A. What is the mass of Solution 3? in g B. What is the density of Solution 2? g/ml solution 1: Mass Empty Flask (g):42.252 Mass NaCl (g):0.911 Volume Water (mL):100 Mass of Flask + Solution (g):43.107 solution 2: MEF: 45.778 mass

    asked by eng on January 8, 2010
  7. PHYSICS

    A stopper tied to the end of a string is swung in a horizontal circle.  If the mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8 s, a.  What is the angular

    asked by Anonymous on September 19, 2011
  8. PHYSICS

    A stopper tied to the end of a string is swung in a horizontal circle. If the mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8 s, a. What is the angular

    asked by LC on February 8, 2012
  9. chem 215

    16.6 ml of a solution is run into an empty flask, from a buret. The mass of the empty flask is 145.0 g. The mass of the flask plus solution is 158.5 g. The density of the solution is _____ g/ml.

    asked by Anonymous on October 7, 2015
  10. chemistry

    A student obtained a clean, dry, glass stoppered flask. The weight of the flask and stopper was 32.634 g. The student filled the flask with water and obtained a mass for the full stoppered flask of 59.479 g. The density of water

    asked by k.rosales on January 29, 2013

More Similar Questions