Recent content by aal0315

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    Finding entropy involving metal in water

    thank you for the help!
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    Finding entropy involving metal in water

    there has to be a way to answer this question .. it is part of an assignment that I have to hand in, so any other suggestions?
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    Energy needed for car to travel-thermodynamics

    ok does this look right to anyone: 25gallons x 1.609 = 40.225km per gallon 150km/40.225 = 3.729 gallons to travel 150km 3.729 x 68% = 2.536kg 2.536 x 4.8x10^7J/kg = 1.22x10^9J ?
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    Finding entropy involving metal in water

    But don't I still need to know the type of metal or mass of metal to find the Q in order to find the deltaS for the metal? And I don't even know how to find out the water part because what is 1.2L in kg?
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    What Was the Original Mass of the Ice Block in the Calorimetry Experiment?

    alright .. i get it now .. thanks for the help!
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    Finding entropy involving metal in water

    Please, can anybody help me with this question?
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    What Was the Original Mass of the Ice Block in the Calorimetry Experiment?

    what do you mean? little confused ... you said to use the m(i)*L for the left side of the equation and then for the right side, don't i use the specific heats for water and aluminum?
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    What Was the Original Mass of the Ice Block in the Calorimetry Experiment?

    so i did what you said and this is what i got (m(i)+2.0x10^-3kg)L = (m(w)*c(w)*deltaT(w) +(m(a)*c(a)*deltaT(a) (m(i)+2.0x10^-3)(333) = (210x10^-3*4186*(12-0)) + (150x10^-3*900*(12-0)) m(i) = 36.54kg this doesn't make sense does it??
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    Finding entropy involving metal in water

    Homework Statement A piece of metal at 80C is placed into 1.2L of water at 72C. This thermally isolated system reaches a final temperature of 76C. Estimate the overall change of entropy for this system. Homework Equations deltaS = Q/T Q=m*c*deltaT The Attempt at a Solution I...
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    What Was the Original Mass of the Ice Block in the Calorimetry Experiment?

    so instead of m(i)*c(i)*deltaT(i) in the above equation, I use m(i)*L, where L is 333 kJ/kg?
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    What Was the Original Mass of the Ice Block in the Calorimetry Experiment?

    Homework Statement A block of ice at 0C is added to a 150g aluminum calorimeter cup which holds 210g of water at 12C. If all but 2.0 g of ice melt, what was the original mass of the block of ice Homework Equations heat gained by ice = heat lost by water + heat lost by calorimeter...
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    Energy needed for car to travel-thermodynamics

    So i do 40.225 x 68% = 27.35 kg to get the mass of 25 gallons of gasoline? and what next? I don't know a formula to figure out the energy given the information.
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    Energy needed for car to travel-thermodynamics

    Homework Statement Gasoline yields 4.8x10^7 J/kg when burned. How much energy does a car use traveling a distance of 150 km if it gets 25 miles per (British) gallon? Assume that the density of gasoline is 68% that of water. Homework Equations The Attempt at a Solution I don't...
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    Stress/Strain with two rods joined together

    thank you :o)
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    Estimate Time for Air Molecule Movement at STP

    thank you for the help