# chemistry

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)

1. 👍 0
2. 👎 0
3. 👁 1,426
asked by Lilit
1. 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

1. 👍 0
2. 👎 0
posted by Sara
2. mass of the steel is not 54.5 g.
I inputed the answer it didn't work. can you please help me

1. 👍 0
2. 👎 0
posted by Lilit
3. 54.5 g steel doesnt work i inputed the answer it was incorrect

1. 👍 0
2. 👎 0
posted by Lilit
4. 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.

1. 👍 0
2. 👎 0
5. the answer is 42.4

1. 👍 0
2. 👎 0
posted by Anita
6. It would 24.9 grams
(105.5g)(0.5°C)(4.184J)=x(19.5)(0.452)

1. 👍 0
2. 👎 0
posted by Halkene
7. The answer with 3 sig figs and units is 43.6 g

1. 👍 0
2. 👎 0
posted by MWS
8. 38.9

1. 👍 0
2. 👎 0
9. I pooped my pants :(

1. 👍 0
2. 👎 0
posted by Joey

## Similar Questions

1. ### 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?

asked by shannon on February 26, 2011
2. ### 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?

asked by Anonymous on November 28, 2012
3. ### 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? Use the

asked by Help on October 23, 2014
4. ### 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?

asked by Mely on October 18, 2010
5. ### 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? Specific heat of water =

asked by Anna on March 11, 2014
6. ### 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? Specific heat of water = 4.18 Specific heat of steel

asked by Philadelphia University on October 31, 2010
7. ### chemistry

A volume of 115 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 21.40 ∘C , what is the mass of the steel bar? Use the

asked by myah on October 19, 2016
8. ### 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? Specific heat of water = 4.18 Specific heat of

asked by MARYD on October 27, 2011
9. ### Chemistry

A volume of 80.0mL 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 21.20 ∘C , what is the mass of the steel bar? Use the

asked by Billy on February 25, 2015
10. ### chemistry

95.0mLmL of H2O\rm H_2O is initially at room temperature (22.0∘C\rm{} ^{\circ}C). A chilled steel rod at 2.0∘C\rm ^{\circ}C is placed in the water. If the final temperature of the system is 21.3∘C^{\circ}C, what is the mass

asked by Anna on March 11, 2014

More Similar Questions