Posted by **Amy** on Saturday, May 7, 2011 at 12:56am.

An aluminum spoon at 84 C is placed in a Styrofoam cup containing 0.180 kg of water at 12 C. If the final equilibrium temperature is 21 C and no heat is lost to the cup itself or the environment, what is the mass of the aluminum spoon?

- Physics -
**drwls**, Saturday, May 7, 2011 at 1:35am
Heat lost by spoon = heat gained by water

Use that heat, the aluminum temperature drop, and the specific heat of aluminum to get the mass.

Ignore the styrafoam mass. It acts as an insulator to keep the heat inside, and weighs very little.

- Physics -
**Amy**, Saturday, May 7, 2011 at 7:13pm
So do I multiply all of the numbers (heat, temp. and specific heat) to get my mass? And for the temp. should I convert it to K? Or leave it to C?

- Physics -
**Amy**, Saturday, May 7, 2011 at 10:29pm
0.98*0.18*21-84 = 21-12*4.186*Ms

11.1132 = 37.674Ms

Ms = 0.29 Kg

my answer wasn't right. what am i doing wrong?

## Answer This Question

## Related Questions

- Physic - Assume all temperatures to be exact. An aluminum spoon at 84 degree C ...
- Physic - If 0.045 kg of ice at 0 C is added to 0.390 kg of water at 34 C in a 0....
- Chemistry - A 25.0 g sample of iron at 398K is placed in a styrofoam cup ...
- physics 2 - A 12.9 gram sample of an unknown metal at 26.5°C is placed in a ...
- physics 2 - A 12.9 gram sample of an unknown metal at 26.5°C is placed in a ...
- physics - A 13 gram sample of an unknown metal at 26.5°C is placed in a ...
- chem - A 25.0 g aluminum block is warmed to 65.2 C and plunged into an insulated...
- physics - A 55.0 g ice cube, initially at 0°C, is dropped into a Styrofoam cup ...
- physics - Assume that 10 g of steam is added to 100 g of water initially at 19°C...
- physics - 1. Assume that 10 g of steam is added to 100 g of water initially at ...

More Related Questions