chemistry

posted by .

100 mL of is initially at room temperature (22)C. A chilled steel rod at 2 C is placed in the water. If the final temperature of the system is 21.2 C, what is the mass of the steel bar?
Specific heat of water = 4.18J/g(C)
Specific heat of steel = 0.452J/g(C)

  • chemistry -

    heat lost by water = heat gained by steel

    (m Cp dT) water = (m Cp dT) steel

    mass steel = (m Cp dT) water / (Cp dT) steel
    mass steel = (125 g) x (4.18 J/gC) x (22.0-21.1 C) / [(0.452 J/gC) x (21.1 - 2.0 C)] = 54.5 g steel

    *** 2 ***
    molar heat capacity is J/mole C not J/gC

    4.18 J/gC x (18.0 g / mole) = 75.2 J/moleC

  • chemistry -

    54.5 g steel doesnt work i inputed the answer it was incorrect

  • chemistry -

    mass of the steel is not 54.5 g.
    I inputed the answer it didn't work. can you please help me

  • chemistry -

    heat lost by water + heat gained by steel = 0
    massH2O x specificheatH2O x (Tf-Ti) + masssteel x specificheatsteel x (Tf-Ti) = 0
    100 x 4.18 x (21.2-22) + masssteel x 0.452 x (21.2-2) = 0
    Solve for mass steel. I get about 40 g but you need to solve it exactly. Watch the signs. Post your work if you get stuck. Tf is final T. Ti is initial T.

  • chemistry -

    the answer is 42.4

  • chemistry -

    It would 24.9 grams
    (105.5g)(0.5°C)(4.184J)=x(19.5)(0.452)

  • chemistry -

    The answer with 3 sig figs and units is 43.6 g

  • chemistry -

    38.9

  • chemistry -

    I pooped my pants :(

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    95.0 mL of H_2O is initially at room temperature (22 degree C). A chilled steel rod at 2 degree C is placed in the water. If the final temperature of the system is 21.3 degree C, what is the mass of the steel bar?
  2. Chemistry

    80.0 mL of water is initially at room temperature (22degrees C). A chilled steel rod at 2 degrees C is placed in the water. If the final temperature of the system is 21.2 degrees C, what is the mass of the steel bar?
  3. college

    105 of is initially at room temperature (22). A chilled steel rod at 2 is placed in the water. If the final temperature of the system is 21.3, what is the mass of the steel bar?
  4. chemistry

    105 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.3, what is the mass of the steel bar?
  5. CHEMISTRY

    90.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.3, what is the mass of the steel bar?
  6. CHEMISTRY

    A volume of 100ml of h20 is initially at room temperature (22.0c). A chilled steel rod at 2.00C is placed in the water. If the final temperature of the system is 21.2C , what is the mass of the steel bar?
  7. chemistry

    85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar?
  8. chemistry

    85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar?
  9. Chemistry Urgent

    95.0mL of H2O is initially at room temperature (22.0∘C ). A chilled steel rod at 2.0∘C is placed in the water. If the final temperature of the system is 21.3∘C , what is the mass of the steel bar?
  10. Chemistry

    A volume of 100.mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.50 ∘C , what is the mass of the steel bar?

More Similar Questions