# physics

(a) 2.0 kg of molten copper at its melting point of 1083 ºC (the copper is 100% liquid) is poured into
a mold in a cooling water bath at 20 ºC. What mass of water is needed to bring the solidified
copper and water to an equilibrium temperature of 30 ºC, assuming the only heat exchange is
between the copper and water.
(Lf copper = 1.34 x 105 J/kg, ccopper = 387 J/kg ºC, cwater = 4186 J/kg ºC)

(b) The molten copper is poured into a rod shaped mold 2 cm in radius and 18 cm long. After
cooling from 1083 ºC to 30 ºC will the rod fit inside a ring with an interior radius of 1.95 cm?
(α = 17 x 10-6 1/ºC, assume the coefficient of expansion is constant over the full temperature
range)

part a.
(mass Cu*Lf Cu) + (massH2O*LfH2O*(deltaT)= 0
solve for mass H2O.

1. 👍 0
2. 👎 0
3. 👁 87

## Similar Questions

1. ### physics

a) 2.0 kg of molten copper at its melting point of 1083 ºC (the copper is 100% liquid) is poured into a mold in a cooling water bath at 20 ºC. What mass of water is needed to bring the solidified copper and water to an

asked by Eric on December 12, 2006
2. ### Chemistry

38.0kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundtry. If the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the

asked by Jacob on August 15, 2012
3. ### chem

The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?

asked by Joseph on February 11, 2010
4. ### Chemistry

In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper

asked by melbell on October 5, 2014
5. ### Chemistry

Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide. Calculate the percent yield of this process if 1.235 g of copper

asked by Raj on October 28, 2007
6. ### Chemistry

You synthesized copper (I) chloride and copper (I) oxide. How do they differ from their copper (II) analogs? comment on the stability of these moist solids in air. If unstable, what is the likely product of decomposition? -I'm not

asked by Dan on November 8, 2015
7. ### Chemistry

1. is it easy to distinguish between between the different oxidation states of copper? why? 2. You synthesized copper (I) chloride and copper (I) oxide. How do they differ from their copper (II) analogs? comment on the stability

asked by Dan on November 8, 2015
8. ### physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 26, 2013
9. ### physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 21, 2013
10. ### physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 24, 2013

More Similar Questions