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
Fed [463]
3 years ago
9

In a constant‑pressure calorimeter, 70.0 mL of 0.770 M H2SO4 is added to 70.0 mL of 0.420 M NaOH. The reaction caused the temper

ature of the solution to rise from 23.14 ∘C to 26.00 ∘C. If the solution has the same density and specific heat as water ( 1.00 g/mL and 4.184 J/(g⋅°C), respectively), what is ΔH for this reaction (per mole of H2O produced)
Chemistry
1 answer:
schepotkina [342]3 years ago
3 0

Answer : The enthalpy of neutralization is, -113.9 KJ/mole

Explanation :

First we have to calculate the moles of H_2SO_4 and NaOH.

\text{Moles of }H_2SO_4=\text{Concentration of }H_2SO_4\times \text{Volume of solution}=0.770mole/L\times 0.070L=0.0539mole

\text{Moles of NaOH}=\text{Concentration of NaOH}\times \text{Volume of solution}=0.420mole/L\times 0.070L=0.0294mole

The balanced chemical reaction will be,

H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O

From the balanced reaction we conclude that,

As, 2 mole of NaOH neutralizes by 1 mole of H_2SO_4

As, 0.0294 mole of NaOH neutralizes by \frac{0.0294}{2}=0.0147 mole of H_2SO_4

Thus, the number of neutralized moles = 0.0147 mole

Now we have to calculate the mass of water.

As we know that the density of water is 1 g/ml. So, the mass of water will be:

The volume of water = 70.0ml+70.0ml=140.0ml

\text{Mass of water}=\text{Density of water}\times \text{Volume of water}=1g/ml\times 140.0ml=140.0g

Now we have to calculate the heat absorbed during the reaction.

q=m\times c\times (T_{final}-T_{initial})

where,

q = heat absorbed = ?

c = specific heat of water = 4.184J/g^oC

m = mass of water = 140.0 g

T_{final} = final temperature of water = 26.00^oC

T_{initial} = initial temperature of metal = 23.14^oC

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

q=140.0g\times 4.184J/g^oC\times (26.00-23.14)^oC

q=1675.27J=1.675kJ

Thus, the heat released during the neutralization = -1.675 KJ

Now we have to calculate the enthalpy of neutralization.

\Delta H=\frac{q}{n}

where,

\Delta H = enthalpy of neutralization = ?

q = heat released = -1.675 KJ

n = number of moles used in neutralization = 0.0147 mole

\Delta H=\frac{-1.675KJ}{0.0147mole}=-113.9KJ/mole

The negative sign indicate the heat released during the reaction.

Therefore, the enthalpy of neutralization is, -113.9 KJ/mole

You might be interested in
Covalent solutes are considered non-electrolytes. What does this mean for the conductivity of the solution? A) Non-electrolytes
iogann1982 [59]

Electrolytes are those which dissociates in solution and produces ions.

Ions can carry current,so Electrolytes conduct electiricity.

And non electrolytes are those which do not dissociate in solution and doesnt produce ions.

Since non electrolytes do not produce ions they cannot conduct electricity.

<u>Hence the right option is:</u>

B) Non-electrolytes dissolve and do not dissociate in water providing no charged ions to conduct electricity.  

5 0
3 years ago
Read 2 more answers
Which will dissolve at the fastest rate?
Nezavi [6.7K]
I need help on this one too I think it might be (b)
7 0
3 years ago
Describe the motion of molecules in an ice cube and in a radiator in winter
pantera1 [17]
<span>ice cube have lower kinetic energy that molecules in a radiators</span>
6 0
3 years ago
Read 2 more answers
How many liters of dinitrogen tetoxide are formed from 2.5 L of nitrogen?
Black_prince [1.1K]

Answer:

2.5 L

Explanation:

The stoichiometric ratio of N2 to N2O4 is 1:1

7 0
3 years ago
How do metalloids affect modern technology?
Lady bird [3.3K]
<em><u>examples of metalloids :
</u>Boron,Silicon ,Germanium are some metalloids ...
<u>what they do:
</u>they are used to form the semiconductors and these semiconductors are used in modern computer technology like in circuits ,chips and computer based gadgets... :) <u>
</u></em>
7 0
3 years ago
Other questions:
  • Which of the statements below correctly describes the chair conformations of trans-1,4-dimethylcyclohexane? A. The higher energy
    10·1 answer
  • How many moles in 28 grams of UO2?
    12·2 answers
  • How many atoms are in 2.5 moles of Br?
    11·1 answer
  • The ΔHvap of a certain compound is 49.09 kJ·mol–1 and its ΔSvap is 53.69 J·mol–1·K–1. What is the boiling point of this compound
    14·1 answer
  • A gas occupies 100 liters at 30 degrees C under a pressure of 1.28 atm. Approximately what volume would the gas occupy at STP (2
    14·1 answer
  • Attempt 4 A galvanic cell has an X electrode with X 2 plus ions in the left beaker and a Y electrode with Y 2 plus ions in the r
    14·1 answer
  • How many bonding and nonbonding electrons are on the carbon atom in CO2?
    9·2 answers
  • What is the boiling point (in °C) of a 1.56 m
    12·1 answer
  • Sally has touched a hot pan on the stove and burnt her hand. This example shows what type of heat transfer?
    12·1 answer
  • 1. What is the mass of 2.23 x 1023 atoms of sulfur?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!