# Young Harris College

How much energy is needed to heat 8.50 g of ice from -30.0 C to 70.0 C?

The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(mol.K) for ice and 75.3 J/(mol.K) for liquid water.

I got 19.24kJ but it isn't correct!!

1. 👍 0
2. 👎 0
3. 👁 177
1. You do this in steps.

q1 = energy needed to heat solid ice from -30 C to solid ice at 0 C.
q1 = mass ice x specific heat ice x (Tfinal-Tinitial) where Tf is 0 and Ti is -30 C.

q2 = heat needed to change the phase at zero C from solid ice to liquid water.
q2 = mass ice x heat fusion

q3 = heat needed to raise the T of liquid water at zero C to 70 c.

q3 = mass water x specific heat liquid H2O x (Tfinal-Tinital) = ?

NOTE: Make sure the units are ok. If you intend to use J/mol K for specific heat then you MUST use mass in mols and not grams. My suspicion is this is where you went wrong.

Total is q1 + q2 + q3

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### Science

Suppose you have a 50.0g sample of ice at -30.0 C. How many joules of heat energy are needed to heat the ice to 0.0 C? How many joules of heat energy are needed to melt the ice? I do not know how to set either of these up.

asked by Mary on January 13, 2016
2. ### chemistry

1. Given that 50 grams of ice is heated at -20.0 °C to steam at 135.0 °C. i. Show the graph of the changes from ice to steam ii. Calculate the energy needed to change the ice to steam Please use these values: Heat of fusion =

asked by bliss on March 9, 2016
3. ### chemistry

find the heat energy needed to change 150g of ice at -15c to ice at -63c

asked by Lezlie on February 14, 2013
4. ### Chem

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

asked by just need set up on April 4, 2013
5. ### Chem

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

asked by greg on April 4, 2013
6. ### Chemistry

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

asked by Cody on April 3, 2013
7. ### Chemistry

How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

asked by B on April 4, 2013
8. ### Chemisty 132

How much energy (in kilojoules) is needed to heat 5.55g of ice from -13.5 ∘ C to 26.5 ∘ C. The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid

asked by Kayla on September 7, 2014
9. ### chemistry

How much energy (in kilojoules) is needed to heat 4.00g of ice from -11.0∘C to 21.5∘C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.

asked by Sally on December 13, 2014
10. ### chemistry

How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water

asked by emily on December 2, 2010

More Similar Questions