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
ad-work [718]
4 years ago
7

An 8.4 g ice cube is placed into 260 g of water. Calculate the temperature change in the water upon the complete melting of the

ice. Assume that all of the energy required to melt the ice comes from the water. Express your answer in terms of the initial temperature of water, T.a. -0.033T - 2.6 °Cb. -2.6T + 0.033 °Cc. 0.033T - 2.6 °Cd. 2.6T -0.033 °C
Chemistry
1 answer:
Komok [63]4 years ago
6 0

Answer:

c. 0.033T - 2.6 °C

Explanation:

Hello,

In this case, we should conclude that the energy lost by the water is gained by the ice to get melted, thus, we can write them in terms of melting and cooling enthalpies:

\Delta H_{ice,melting}=-\Delta H_{water,cooling}

First term includes melting enthalpy of ice that is 333.89 J/g and the second one specific heat of water that is 4.18 J/g°C, therefore, we obtain:

8.4g*333.89\frac{J}{g}=-260g*4.18\frac{J}{g\°C}(T_2-T_1)  \\\\(T_2-T_1) =-\frac{8.4g*333.89\frac{J}{g}}{260g*4.18\frac{J}{g\°C}} \\\\(T_2-T_1)=-2.6\°C

Thus, answer should be c. 0.033T - 2.6 °C since it includes the temperature decrease of water due to the undergoing cooling.

Best regards.

You might be interested in
The following reaction was carried out in a 3.00 L reaction vessel at 1100 K:
Nady [450]

Answer:

Q=0.840

Explanation:

Hello,

In this case, since the given undergoing chemical reaction is correctly balanced, the reaction quotient is computed as well as the equilibrium constant but in terms of the given concentrations that are:

C_{C}=\frac{5.25mol}{3.00L} =1.75M\\C_{H_2O}=\frac{12.2mol}{3.00L} =4.07M\\C_{CO}=\frac{3.90mol}{3.00L}=1.30M\\C_{H_2}=\frac{7.90mol}{3.00L} =2.63M

In such a way, the reaction quotient turns out:

Q=\frac{C_{CO}C_{H_2}}{C_{H_2O}}=\frac{1.30M*2.63M}{4.07M}\\ Q=0.840

Taking into account that carbon is not included since it is solid.

Best regards.

7 0
3 years ago
The domain Archaea are unicellular prokaryotes and can be autotrophs or heterotrophs
nexus9112 [7]

Answer:

I think its true I dont really know

Explanation:

true

7 0
3 years ago
Which of the following is an example of a neutralization reaction?
Anastasy [175]

HCl (aq) + NaOH (aq)→H2O (l) + NaCl (aq)
Acid reacts with base to give H2O and salt
8 0
3 years ago
Oxygen has an electronegativity of 3.5, and carbon has an electronegativity of 2.5. how is charge distributed on an oxygen atom
vlabodo [156]
When oxygen has an electronegativity of 3.5, and carbon has an electronegativity of 2.5, then the oxygen atom would have a slightly negative charge. The oxygen atom in  the carbon monoxide molecule would pull more electrons to its side since it has higher electronegativity making it slightly negative and the carbon would have a slightly positive charge as it would contain less electrons. This results to the formation of a polar molecule. A polar molecule is made when the molecule contains a slightly positive end and a slightly negative end. It would have a net dipole which is a result of the partial opposing charges in the molecule.
6 0
3 years ago
Calculate δg∘rxn and e∘cell for a redox reaction with n = 3 that has an equilibrium constant of k = 4.4×10−2. you may want to re
lapo4ka [179]
a) First, to get ΔG°rxn we have to use this formula when:

ΔG° = - RT ㏑ K 

when ΔG° is Gibbs free energy 

and R is the constant = 8.314 J/mol K

and T is the temperature in Kelvin = 25 °C+ 273 =  298 K 

and when K = 4.4 x 10^-2

so, by substitution:

ΔG°= - 8.314 * 298 *㏑(4.4 x 10^-2)

      = -7739 J  = -7.7 KJ


b) then, to get E
° cell for a redox reaction we have to use this formula:

ΔE° Cell = (RT / nF) ㏑K

when R is a constant = 8.314 J/molK

and T is the temperature in Kelvin = 25°C + 273 = 298 K

and n = no.of moles of e- from the balanced redox reaction= 3

and F is Faraday constant = 96485 C/mol

and K = 4.4 x 10^-2

so, by substitution:

∴ ΔE° cell = (8.314 * 298 / 3* 96485) *㏑(4.4 x 10^-2)

              = - 2.7 x 10^-2 V
  
8 0
3 years ago
Other questions:
  • Calcium hypochlorite (ca(ocl)2, mw = 142.983 g/mol) is often used as the source of the hypochlorite ion (ocl–, mw = 51.452 g/mol
    13·1 answer
  • How can you use qualitative properties to identify a gas sample?
    8·1 answer
  • Cooking chicken in a oven is physical change or chemical change
    13·1 answer
  • 1. What causes shadows?
    15·1 answer
  • The La Brea Tar Pits are _______.<br> (multiple choice answers in attached file)
    7·2 answers
  • Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. draw
    6·1 answer
  • Will mark brainliest!
    10·1 answer
  • A solution is made by mixing 500.0 mL of 0.02558 M Na2HAsO4 with 500.0 mL of 0.03961 M NaOH . Complete the mass balance expressi
    12·1 answer
  • Divers who go to great depths in the ocean experience large differences in pressure between the surface and their final destinat
    6·1 answer
  • Which describes the oxidizing agent in a chemical reaction?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!