1. How much energy would be required to melt 450 grams of ice at 0°C?
2. How many joules of energy would be release as 325 grams of steam condenses to liquid water at 100°C?
3. Calculate the number of joules of energy necessary to vaporize 85 grams of water at 100°C.
4. How much energy would be released by 225 grams of water solidifying at 0°C?
5. How much energy must be absorbed by 20.0 g of water to increase its temperature from 283.0 °C to 303.0 °C?
6. When 15.0 g of steam drops in temperature from 275.0 °C to 250.0 °C, how much heat energy is released?
7. How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?
8. What is the specific heat capacity of silver metal if 55.00 g of the metal absorbs 198 joules of heat and the temperature rises 15.0°C?
9. A certain mass of water was heated with 41,840 Joules, raising its temperature from 22.0 °C to 28.5 °C. Find the
mass of the water, in grams.
10. The specific heat of ethanol is 2.46 J/g oC. Find the heat required to raise the temperature of 193 g of ethanol
from 19oC to 35oC.
11. How much energy would be necessary to convert ice at -23.0°C to steam at 118°C? It may help to sketch the heating curve to see the energy changes required.
WILL BE MARKED BRAINLIEST
Solved
Show answers
More tips
- C Computers and Internet Porn Banner: What It Is and How to Get Rid Of It?...
- C Computers and Internet Отправляем смс через интернет: легко и просто...
- L Leisure and Entertainment The Best Film of 2010: A Look Back at the Academy Awards...
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- F Family and Home Why Having Pets at Home is Good for Your Health...
Answers on questions: Physics
- P Physics determine period and frequency of a car whose mass is 1400 kg whose shock absorbers have have a spring constant of 6.5×10^4 after hitting the bump assuming the shock...
- P Physics Alistar places a 6.4 kg block on an incline plane that is 23 degrees above the horizontal. The block starts from rest, and in 2.2 seconds, travels 1.4 meters. What...
- P Physics . What is the lowest frequency (excluding the fundamental) at which standing wave can occur in a 0.90-m long pipe with both ends open. The speed of sound in air is...
- P Physics 8. The force of gravitation between two objects is ‘F and the distance between them is R what will be the effect on force of gravitation if a. R is reduced to one-fourth...
- P Physics A 7,000 kg plane is launched from an from an aircraft carrier in 2 sec by a force of 350,000 N. What is the plane s acceleration...
- P Physics Sexual reproduction requires parents and this is considered a...
- P Physics A box of weight 20N is placed on ground of 20meter square. Find the pressure exerted by the box....
- P Physics Dimensional Analysis...
- P Physics Recall that if the colliding objects have hard surfaces , the collision is elastic...
- P Physics Why is it an advantage to the beef producer that beef cattle are foragers? A. The cattle can graze for grain to eat. B. It reduces labor as long as there is a good...
Ответ:
Explanation:
1. The amount of heat needed to melt ice at 0°C is equal to the mass of the ice times the latent heat of fusion.
q = mL
q = (450 g) (334 J/g)
q = 150,300 J
q = 150 kJ
2. The amount of heat released by the condensation of steam at 100°C is equal to the mass of the steam times the latent heat of vaporization.
q = mL
q = (325 g) (2260 J/g)
q = 734,500 J
q = 735 kJ
3. q = mL
q = (85 g) (2260 J/g)
q = 192,100 J
q = 190 kJ
4. q = mL
q = (225 g) (334 J/g)
q = 75,150 J
q = 75.2 kJ
5. Above 100°C, water is steam. The amount of heat needed to increase the temperature of steam is equal to its mass times its specific heat times the change in temperature.
q = mCΔT
q = (20.0 g) (2.03 J/g/°C) (303.0°C − 283.0°C)
q = 812 J
6. q = mCΔT
q = (15.0 g) (2.03 J/g/°C) (250.0°C − 275.0°C)
q = -761 J
7. q = mCΔT
q = (10.0 g) (0.90 J/g/°C) (55°C − 22°C)
q = 297 J
8. q = mCΔT
198 J = (55.0 g) C (15°C)
C = 0.24 J/g/°C
9. q = mCΔT
41,840 J = m (4.184 J/g/°C) (28.5°C − 22.0°C)
m = 1540 g
10. q = mCΔT
q = (193 g) (2.46 J/g/°C) (35°C − 19°C)
q = 7600 J
11. First, the temperature of the ice must be raised to 0°C.
q = mCΔT
q = m (2.09 J/g/°C) (0°C − (-23.0°C))
q/m = 48.1 J/g
Next, the ice must be melted.
q = mL
q/m = 334 J/g
Then, the water must be heated to 100°C.
q = mCΔT
q = m (4.184 J/g/°C) (100°C − 0°C)
q/m = 418.4 J/g
The water is then vaporized.
q = mL
q/m = 2260 J/g
Finally, the steam is heated to its final temperature.
q = mCΔT
q = m (2.03 J/g/°C) (118°C − 100°C)
q/m = 36.5 J/g
So the total amount of energy needed is:
q/m = 48.1 J/g + 334 J/g + 418.4 J/g + 2260 J/g + 36.5 J/g
q/m = 3100 J/g
Ответ:
Yep!
Explanation: