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
kati45 [8]
3 years ago
10

If 30.0 ml of 0.150 m aqueous sodium hydroxide is mixed with 30.0 ml of 0.150 m aqueous hydrochloric acid in a calorimeter at an

initial temperature of 25.0 degrees celsius, what is the enthalpy change of this reaction if the final temperature reached in the calorimeter is 27.5 degrees celsius? naoh + hcl nacl + h2o
Chemistry
1 answer:
umka21 [38]3 years ago
3 0
Answer : As given in the question the concentration of acid and base are in equimolar proportion so,

the simple net ionic reaction that the system is undergoing can be given as,
H^{+}  _{(aq.)}   +  OH^{-} _{(aq.)} ----\ \textgreater \  H_{2} O +  heat

we can now calculate the total number of moles reacting in the species as,

(30 mL) X (1L/1000ML) X 0.150 moles = 4.5 X 10 ^{-3} moles.

Now, we know the specific heat of water as 4.186 J/g °C.

Now considering the total volume of the product as 60 mL or 60 g (as it is water it can be g or mL) hence, ΔC is 2.5 C.

Now converting these into joules = 4.186 J/g °C X 2.5 X 60 = 627.9 Joules.

On dividing this we get 627.9 Joules / 4.5 X 10 ^{-3} moles = 140 KiloJoules/mole.

So the answer is 140 KJ/M.
You might be interested in
A burning splint will burn more vigorously in pure oxygen than in air why?
eimsori [14]
Oxygen is a reactant in combustion and the concentration of oxygen is higher in pure oxygenthan it is in air.
4 0
3 years ago
Identify and explain the significance of one factor that influenced the outcome of the civil war
solmaris [256]
 North was no longer willing to tolerate slavery as being part of the fabric of US society and that the political power brokers in Washington were planning to abolish slavery throughout the Union. Therefore for many people slavery is the key issue to explain the causes of the American Civil War. However, it is not as simple as this and slavery, while a major issue, was not the only issue that pushed American into the ‘Great American Tragedy’.
5 0
3 years ago
PH of 6.7X10^-4 of H2SO4
mezya [45]
Assuming 6.7x10^-4 is in units of molarity, simply do -log(M)=pH. Substitute and get -log(6.7x10^-4) and when solving you find 3.17 is the pH
5 0
3 years ago
How to separate unreacted iron
taurus [48]

Answer:

through magnetization

6 0
3 years ago
what is the amount of heat,in joules, required to increase the temperature of a 49.5-gram sample of wanted from 22c to 66c
aniked [119]

Answer :

the amount of heat,in joules, required to increase the temperature of a 49.5-gram sample of wanted from 22°c to 66°c is 9.104 Joules.

Explanation:

The answer can be calculated using the formula

Q = mCрΔT

where

Q is the amount of heat required in joules to raise the temperature.

m is the mass of the sample in Kg.

Cp is the specific heat of the sample in J/Kg°C.

ΔT is the change in temperature required.

Here, m = 49.5-gram = 0.0495 kg

Cp = 4.18 J/Kg°C (for water)

T₁ = 22°C  ; T₂ = 66°C

ΔT =  66 - 22 = 44

Substituting values in Q = mCрΔT

Q = (0.0495)(4.18)(44)

                  Q = 9.104 J

5 0
3 years ago
Other questions:
  • What is the value of Keq for the reaction expressed in scientific notation? 2.1 x 10-2 2.1 x 102 1.2 x 103 1.2 x 10-3
    14·2 answers
  • Which statement best describes the pH of pure water?
    14·2 answers
  • What volume of neon gas occupies a container if 322 grams of neon is at 0.955 atm and -28.0 degrees Celsius?
    14·1 answer
  • Ranjana has two unknown solutions X and Y
    14·1 answer
  • What is the relationship between a white dwarf and black dwarf?
    9·2 answers
  • For the reaction Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 4.3 moles of chlorine?
    5·1 answer
  • Milk of magnesia, a suspension of mg(oh)2 in water, reacts with stomach acid (hcl) in a neutralization reaction. mg(oh)2(s) + 2
    14·1 answer
  • Liquid water is about 800 times denser than dry air under standard conditions. Use kinetic molecular theory to explain this diff
    14·1 answer
  • An electrolysis reaction is
    15·1 answer
  • Geologic evidence shows that Earth's tectonic plates can move thousands of kilometers across the Earth's surface. These movement
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!