Gen Chem questions

[151AND8TH]

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How many grams of ICE would it take to drop the temperature of 150-g of WATER from 24.3 to 23.6? (using a polystyrene coffee cup calorimeter at room temperature)

How can I calculate the H-fusion of ICE from the above data?

 

[Loop]

I believe you forgot to include some important information for this question.

 

[151AND8TH]

I believe you forgot to include some important information for this question.

Thanks..

 

[doc toothache]

How many grams of ICE would it take to drop the temperature of 150-g of WATER from 24.3 to 23.6? (using a polystyrene coffee cup calorimeter at room temperature)

How can I calculate the H-fusion of ICE from the above data?

About 1 gm. (?)

 

[bigstix808]

How many grams of ICE would it take to drop the temperature of 150-g of WATER from 24.3 to 23.6? (using a polystyrene coffee cup calorimeter at room temperature)

How can I calculate the H-fusion of ICE from the above data?

do they give you the specific heats of ice and water??

 

[Chga]

Lets do this problem experimentaly😀

 

[doc toothache]

Lets do this problem experimentaly😀

😀 Make it a race to see who can come up with the answer first.😀

 

[Chga]

DQ = m c DT
D= Delta

The specific heat of water is 1 cal / g K by definition. That of ice is .51
Water first
DT= 0.7
c is given
m = 150g
so Q for needed for water is 105

now for the ICE
DT= im guessing its 23.6 since ice is 0 at initial and you want to goto 23.6
c is given
m is what you need
Q =105

so do plug in the info and solve for m
i get 8.72g

did i do it right?

 

[doc toothache]

DQ = m c DT
D= Delta

The specific heat of water is 1 cal / g K by definition. That of ice is .51
Water first
DT= 0.7
c is given
m = 150g
so Q for needed for water is 105

now for the ICE
DT= im guessing its 23.6 since ice is 0 at initial and you want to goto 23.6
c is given
m is what you need
Q =105

so do plug in the info and solve for m
i get 8.72g

did i do it right?

The heat of fusion for water (ice) is 80cal/g.

 

[doc toothache]

How many grams of ICE would it take to drop the temperature of 150-g of WATER from 24.3 to 23.6? (using a polystyrene coffee cup calorimeter at room temperature)

How can I calculate the H-fusion of ICE from the above data?

You can calculate to heat of fusion for water (ice) provided you were given the quantity of ice required to achieve your temperature change. Judging from the way the first part of the question was phrased, it appears the second question you had was interjected as an afterthought since you could not remember the heat of fusion of water. Is this correct? It is unlikely that you were asked to solve a problem with two unknowns.

 

[Chga]

The heat of fusion for water (ice) is 80cal/g.

i just went to a random site and got the number. just sub the 80 in for the .51

 

[tinman831]

You shouldn't be asking homework questions on SDN. TSk TSk!