posted by .

Hi, I just need to know if I finally got this exercise right.

Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 Celsius are converted to 50 grams of ice at -125 Celsius.

so,

qw= 50*4.184J/g C (125 C-o)= 26.15 x 10^3

qi= 50*2.09*(-125)=-13.065 KJ

q= 50*1.860 (-125)= -11.63 KJ

q1+q2=q3= -11.92 kJ

please let me know if this way is correct thanks

No, I didn't read past the first line. Steam is not liquid water; therefore, you may not use the specific heat of water. You must use the specific heat of steam. THEN, it doesn't go from 125 to zero. It goes from 125 to 100.
In the initial post I told you what we were converting; i.e., from steam at 125 to steam at 100, then condense the vapor steam to liquid water at 100, then move form liquid water at 100 to liquid water at zero, then heat of fusion to freeze water to ice at zero, then move from ice at zero to ice at -125.

## Similar Questions

1. ### Chemestry

Calculater the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C?
2. ### Chemistry

Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are convert to 50 grams of ice at 125 C please help
3. ### chemistry

is this the right anser? for this problem please let me know thanks calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C so 50 grams of H2O Ti= 124 C Tf= -125

Calculate the amount of heat in kilojoules reased when 50 of steam at 125 C are converted to 50 grams of ice at -125 C. AHsteam = m * Cp steam * At q1= 50g * 4.184 J/g C * (125-100)C= 5.23 x 10^J q2= m * AH 50g * 5230 J/g = 2.61 x …
5. ### chemistry

How much heat in kilojoules is evolved in converting 1.00 mol of steam at 145 Celsius to ice at -50 Celsius?
6. ### Chemistry

Given that the specific heat capacities of ice and steam are 2.06 J/g degrees celsius, respectively, and considering the information about water given in exercise 16, calculate the total quantity of heat evolved when 10.0g of steam …
7. ### physics

The amount of heat released when 100 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is ____ J.
8. ### Physical Science

A 5.00 kg block of ice at –25 oC is converted to steam at 125 oC. How much energy (in kilojoules) is expended in this process?
9. ### chemistry

calculate the amount of heat released when 77.0g of steam at 104.5 celsius cools to ice at 0.0 celsius. I don't understand the steps to take to solve this problem. Can someone walk me through it please?
10. ### 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 = 334.16 …

More Similar Questions