(a)
Interpretation:
Interpret the heat change in joules to vaporise 10 g of water.
Concept Introduction:
Heat for changing the state of water from ice can be determined as:
Heat required for changing the state of ice from solid to liquid.
Where, m is mass of ice or water
S is specific heat of water
dT is the change in temperature
(b)
Interpretation:
Interpret the heat change in kJ to vaporise 50 g of ethanol.
Concept Introduction:
Heat for changing the state of water from ice can be determined as:
Heat required for changing the state of ice from solid to liquid.
Where, m is mass of ice or water
S is specific heat of water
dT is the change in temperature
(c)
Interpretation:
Interpret the heat change in joules to condense 8.0 g of acetic acid.
Concept Introduction:
Heat for changing the state of water from ice can be determined as:
Heat required for changing the state of ice from solid to liquid.
Where, m is mass of ice or water
S is specific heat of water
dT is the change in temperature
(d)
Interpretation:
Interpret the heat change in kJ to condense 0.175 kg of ammonia.
Concept Introduction:
Heat for changing the state of water from ice can be determined as:
Heat required for changing the state of ice from solid to liquid.
Where, m is mass of ice or water
S is specific heat of water
dT is the change in temperature
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Basic Chemistry
- The evaporation of water is endothermic: H2O(l) + 44.01 kJ --------> H2O(g) If 275 kJ of heat is absorbed, what mass of water will evaporate? A. 2.18 x 105 g B. 6.25 g C. 0.347 g D. 113 garrow_forward4. Match the following physical change with the correct phase transition label. Question 4 options: Freezing Evaporation Condensation Sublimination 1. Icicles disappear 2. Wet clothes dry 3. Water in the air becomes dew on the grass 4. Kool-aid becomes popsiclesarrow_forwardIndicate whether heat is absorbed or released in each process. a. melting 100 g of ice b. freezing 25 g of water c. condensing 20 g of steam d. vaporizing 30 g of waterarrow_forward
- Ethyl chloride, C2H5CI, is used as a local anesthetic. It works by cooling tissue as it vaporizes. The heat of vaporization is 26.4 kJ/mol. How much heat could be removed by 645.1 g of ethyl chloride? O A) 1584 kJ B) 264 kJ O C) 2.64 kJ O D) 1703 kJarrow_forward1. What property of water explains why our body temperature remains essentially constant? a. Water has high heat of vaporization. b. Water has a high specific heat. c. Water has high density in its liquid. d. Water has boiling point. 2. Iodine was placed in am beaker and was covered with a watch glass. After a while, crystals of iodine formed on the underside of watch glass. Which of the following phase change occurred? a. Sublimation b. Condensation c. Freezing d. meltingarrow_forwardWhich of the following does NOT represent a step on the heating curve of water? The temperature of steam cannot exceed 100 °C a. The temperature of ice remains at 0 °C as it melts b. The temperature of liquid water increases linearly as it is heated c.The temperature of liquid water remains at 100 °C as it boils d.Both liquid water and ice are present at 0 °C.arrow_forward
- 2. Calculate the amount of heat needed to melt 120.0 g of pure ethanol. Calculate the amount of heat needed to raise the temperature of 2.34 moles of pure liquid ethanol from -84.0 °C to 21.0 °C. (Ethanol melts at-117.3 °C) 3.arrow_forward6. What do heating and cooling curves show about a given substance? A. Chemical change B. Energy change C. Phase change D. Temperature change 7. The temperature at which a substance changes from a gas to a liquid is called the A. Condensation point B. Freezing point C. Melting point D. Vaporization pointarrow_forwardHow much energy is absorbed or released when 2.30 moles of water (4.184 J/g°C) cools from its normal boiling point to 75°C? a. -4330 J b. -241 J c. +241 J d. +722 Jarrow_forward
- What's the heat change in Joules for vaporization of 9.00g of water at 100 degrees celciusarrow_forwardHow much heat is required to heat 59.3g of liquid ethanol from -7*C to the vapor state at 78*Carrow_forwardHow much heat must absorbed to warm 3.7 moles from T1 to T2 according to the picture?arrow_forward
- Chemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub Co