Pre-Lab Questions Lab 8A Calorimetry 1. What is specific heat capacity? 2. What

Question

Pre-Lab Questions Lab 8A Calorimetry 1. What is specific heat capacity? 2. What is the density of water? 3. 4. One Calorie - 000 calories What is the specific heat capacity of water? 5. Which substance has the highest specific heat capacity? How much heat energy is required to raise the temperature of 50 mL of water from 25°c to 90°C? 6. One serving of Tostitos is 140 Calories. If all of that energy were used to heat 1000 mL of water at room temperature (25°C), what would be the final temperature of the water/steam? 7. 123

Explanation / Answer

Q4

specific heat of water is :

1 cal / g °C

4.184 J/g°C

Q5

food is mostly water, therefore, water will hav ealways higher specific heat than food, since all other species require less heat to change 1 °C per unit mass

Q6

Q = m*C*(Tf-Ti)

D = 1 g/mL so m = 50mL = 50 g

Q =50*4.184*(90-25)

Q = 13598 J

Q7

Q = m*C*(Tf-Ti)

Q = 140 Cal = 140*10^3 Cal = (140*10^3)(4.184) J = 585760 J

585760= 1000*4.184*(Tf-25)

this is too much ehat,

heat for water to 100 --> Q = 1000*4.184*(100-25) = 313800 J

Q left to vaporize = 585760-313800 = 271960

latent heat is 2264.76 kJ/kg.

2264.76 *10^3 = 2264760-271960

therefore

it will be steam/water mix at 100°C

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