1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kruka [31]
3 years ago
6

The dissociation of a salt in water to from an aqueous solution is called enthalpy of solution, ΔHsoln. The ΔHsoln for CaCl2 is

-120 kJ/mol. When CaCl2 is added to water _____. A) the temperature of the water will increase. B) the temperature of the water will remain the same. C) the process is endothermic. D)nothing will occur, CaCl2 is insoluble.
Chemistry
1 answer:
Troyanec [42]3 years ago
5 0

Answer:

A) the temperature of the water will increase.

Explanation:

Consider, first, the dissolution of anhydrous calcium chloride, CaCl2 in water. CaCl2 is a very water soluble ionic compound that, in solution, dissociates into the component ions, Ca2 + and Cl-, which interact strongly with water molecules.

The thermochemical equation that represents the process of dissolution of CaCl2 (s) indicates that it is a strongly exothermic process:

CaCl2(s) --> Ca+2(aq) + 2Cl- (aq)   ΔH = -82.8 kJ

Therefore, dissolving CaCl2 in water will produce the release of energy in the form of heat (82.8 kJ per mole of dissolved CaCl2)

You might be interested in
The most recent treason indictment involved a U.S. citizen who was accused of turning into an operative for which of the followi
likoan [24]
The correct answer would be C isis. 
3 0
3 years ago
A chemical ________<br> is like a recipe for a chemical substance.
goldfiish [28.3K]

Answer:

iron

Explanation:

5 0
3 years ago
Cell are the blank unit of all living organisms​
leonid [27]
Yes cells are the blank unit for all things that are living
4 0
3 years ago
The enthalpy change for converting 10.0 g of ice at -25.0 °C to water at 90.0 °C is __________ kJ. The specific heats of ice, wa
Nina [5.8K]
AH1 = m * c1 * AT1 calculate this for ice (-25C to 0C) AH2 = AHfus(1 mole)=6.01 kJ = 6010 J AH3 = m *c3 * AT3 calculat this for water (0C to 100C) AH4 = AHvap(1mole)=40.67 kJ = 40670 J AH5= m * c5 * AT5 calculate this for steam (100C to 125C) 
Sum ---- AH1+AH2+AH3+AH4+AH5 
Data m=18g (1mole water) 
c1=specific heat ice= 2.09 J/g K c3=specific heat water= 4.18 J/g K c5=specific heat steam= 1.84 J/g K 
AT = (Tend - Tinitial) as this is a difference between temperatures it doesn't matter the units Celsius or Kelvin. Kelvin (K)=Celsius (C)+273.15 
AT1 = 0C - (-25C)= 25C= 273.15K - 248.15K= 25K AT3= 100C - 0C = 100C= 100K AT5= 125C - 100C= 25C=25K
6 0
3 years ago
A sample of a gas at 25°C has a volume of 150 mL when its pressure is 0.947 atm. What will the temperature of the gas be at a pr
sertanlavr [38]

Answer: The temperature of the gas at a pressure of  0.987 atm and volume of 144mL is 25.16^0C

Explanation:

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 0.947 atm

P_2 = final pressure of gas = 0.987 atm

V_1 = initial volume of gas = 150 ml

V_2 = final volume of gas = 144 ml    

T_1 = initial temperature of gas = 25^0C=(25+273.15)K=298.15K

T_2 = final temperature of gas = ?

Now put all the given values in the above equation, we get:

\frac{0.947\times 150}{298.15}=\frac{0.987\times 144}{T_2}

T_2=298.31K=(298.31-273.15)^0C=25.16^0C

The temperature of the gas at a pressure of  0.987 atm and volume of 144mL is 25.16^0C

4 0
3 years ago
Other questions:
  • In examining a protein molecule, you discover that it has not file fed properly. Why is this alarming?
    9·1 answer
  • How many significant figures should the following answer have? (23.34 cm)(90076 cm)(2.1223 cm) = cm
    14·2 answers
  • 2 H2 + O2 → 2 H2O What is the product of this chemical reaction
    13·1 answer
  • What is theWhat is the approximate tilt of the earth's axis? approximate tilt of the earth's axis?
    13·1 answer
  • How many electrons does uranium have​
    15·2 answers
  • A scientist finds a fossil that contains a long beak. He can assume which of the following things?
    9·1 answer
  • PLZ HELP!! I WILL GIVE BRAINLIEST!! 50+PTS!! PLZ HELP!!!! In an exothermic reaction at equilibrium, what is the effect of loweri
    7·2 answers
  • Enumere por lo menos 5 objetos que antiguamente se hacían con otro material y en la actualidad se hacen con un polímero. Identif
    7·1 answer
  • 1. A sealed 2500mL flask is filled to capacity with 163g of a slimy green liquid. What is the density of the liquid?
    14·2 answers
  • What are the ways that energy<br> conversion can occur?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!