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
kakasveta [241]
3 years ago
5

Will medal!!!

Chemistry
1 answer:
hjlf3 years ago
5 0
Δ H reaction = q / n where q: amount of heat released and n is number of moles of substance.
q = m . C . ΔT where:
m = mass of substance (g)
C = Specific heat capacity (4.18)
ΔT = change in temperature = 24.25 - 23.16 = 1.09
q = 1000 x 4.18 x 1.09 = 4556 J = 4.556 kJ
number of moles (n) = Molarity (M) x Volume (L)
                                 = 0.185 M x 0.07 L = 0.01295 mole
Δ H = q / n = - (4.556 kJ / 0.01295 mole) = -351.8 kJ / mol
Note: it is exothermic reaction (-ve sign)  i.e. temperature is raised

You might be interested in
Which of the following is true about nuclear fusion
Sonja [21]

Answer:

 i would assume that it would be (a)

Explanation:

The Sun generates its energy by nuclear fusion

NUCLEAR FISSION is when the heavy atom is split

fusion energy is scientifically feasible. Plasma conditions that are very close to those required in a fusion reactor are now routinely reached in experiments

mass gets lost is nuclear fusion

so (a) is the most accurate

4 0
3 years ago
Read 2 more answers
His transmitter is mostly located in diffuse neuronal systems in the CNS, with cell bodies particularly in the raphe nuclei. It
joja [24]

Answer: The correct answer is a) Acetylcholine.

Explanation:

The acetylcholine is a very important neurotransmitter involved in the mediation of synaptic activity between neurons. Among its most important functions we find: expression of mood states, vasodilation, gastrointestinal motility, bronchoconstriction, circular iris muscle contraction and sweat gland secretion.

Therefore the correct answer is a) Acetylcholine.

8 0
3 years ago
Sodium (na), atomic number 11, has a tendency to lose an electron in the presence of chlorine. after losing the electron, na has
Paha777 [63]
Eleven because protons don’t leave.
3 0
3 years ago
How do you know the difference between a compound and mixture?
lorasvet [3.4K]

Answer:

A compound can only be seperated through chemical means while a mixture are formed when two substances are added together without chemical bonds being formed.

Explanation:

3 0
3 years ago
If a reaction has a very low activation energy, the products would be expected to form quickly at high temperatures. Select the
melamori03 [73]

Answer: Option (c) is the correct answer.

Explanation:

It is known that when Gibb's free energy, that is, \Delta G has a negative value then the reaction will be spontaneous and the formation of products is favored more rapidly.  

Activation energy is defined as the minimum amount of energy required to initiate a chemical reaction.

So, when reactants of a chemical reaction are unable to reach towards its activation energy then a catalyst is added to lower the activation energy barrier so the reaction can take place rapidly.

Since, the given reaction has low activation energy. Therefore, there is no need to add a catalyst.

And, when value of \Delta G is positive then the reaction is spontaneous in nature and formation of products is less favored.

Thus, we can conclude that for the given situation positive delta G is the reason that a reaction might form products very slowly, or not at all.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Boiling refers to which phase change?
    6·1 answer
  • Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and liquid water. Which is the correct bala
    12·1 answer
  • Given their location on the periodic table, identify the ionic charge for each element and predict the compound formed by the ba
    10·2 answers
  • Need a little help with chemistry:) <br> *if you don’t know don’t put anything*
    8·2 answers
  • Find the density of an empty tissue box with a mass of 345 grams and a volume of 1125 cm3.
    11·1 answer
  • How does phosphorus enter the human body?
    11·1 answer
  • Brainiest The Alpine Marmot is a kind of large ground squirrel that lives in the mountains and eats grasses, herbs, grains and s
    8·2 answers
  • What is metal ? Where does it coke from ?
    6·2 answers
  • What is the definition of a community in environmental science
    13·1 answer
  • What phase does chloride occur in?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!