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
mamaluj [8]
3 years ago
5

Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide according to the chemical equation shown below.

Chemistry
1 answer:
UNO [17]3 years ago
6 0

<u>Answer:</u> The enthalpy change of the reaction is -361.6 kJ

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of sodium = 0.025 moles

Molar mass of sodium = 23 g/mol

Putting values in above equation, we get:

0.025mol=\frac{\text{Mass of sodium}}{23g/mol}\\\\\text{Mass of sodium}=(0.025mol\times 23g/mol)=0.575g

We are given:

Mass of water = 100.00 g

Mass of sodium = 0.575 g

Mass of solution = 100.00 + 0.575 = 100.575 g

To calculate the amount of heat absorbed, we use the equation:

q=m\times C\times \Delta T

where,

q = amount of heat absorbed = ?

m = mass of solution = 100.575 g

C = specific heat capacity of solution = 4.18 J/g°C

\Delta T = change in temperature = (T_2-T_1)=(35.75-25.00)=10.75^oC

Putting all the values in above equation, we get:

q=100.575g\times 4.18J/g^oC\times 10.75^oC=4519.34J=4.52kJ

When heat is absorbed by the solution, this means that heat is getting released by the reaction.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

For the given chemical reaction:

2Na(s)+2H_2O(l)\rightarrow NaOH(aq.)+H_2(g)

When 0.025 moles of sodium is reacted, the heat released by the reaction is 4.52 kJ

So, when 2 moles of sodium will react, the heat released by the reaction will be = \frac{4.52}{0.025}\times 2=361.6kJ

Hence, the enthalpy change of the reaction is -361.6 kJ

You might be interested in
The number of moles of c atoms in 3.20 moles of c2h60
Vladimir [108]
3,2mol * 2 = 6,4mol of C atoms
7 0
3 years ago
Entropy of a system decreases with decrease in Temperature T/F
Svet_ta [14]

Answer: The given statement is true.

Explanation:

Entropy means the measure of randomness present in a substance. That is, an increase in temperature will lead cause more motion in the particles of a substance more will be their kinetic energy.

As a result, there will occur more collisions due to which randomness of molecules will increase. Hence, there will be increase in entropy.

So, when we decrease the temperature then there will be decrease in motion of particles. As a result, lesser number of collisions will take place between them. Hence, degree of randomness will also decrease.

Thus, we can conclude the statement entropy of a system decreases with decrease in temperature, is true.

3 0
3 years ago
Draw the structural formula for fatty acid C 18:2 9 a 12a
qwelly [4]

Answer:

............................................................................

Explanation:

7 0
2 years ago
What is the difference between an Isotope and an Allotrope?
Kaylis [27]
Allotropes are elements on the periodic table that have more than one crystalline form . There are three forms of the element carbon : Diamond, Graphite, and Fullerenes. Isotopes are atoms of the same element with the same atomic number but have a different mass number.
8 0
3 years ago
Why does the mixture of Fe and S have different reactions than the compound FeS?
mario62 [17]

Answer:

fe+s is a mixture of iron and sulphur and it can be separated by magnetic separation. But FeS is a compound formed by heating iron and sulphur together.it can't be separated by any method.

Here are some of the differences between a mixture of iron and sulfur, and iron sulfide: the mixture can contain more or less iron, but iron sulfide always contains equal amounts of iron and sulfur. the iron and sulfur atoms are not joined together in the mixture, but they are joined together in iron sulfide.

5 0
2 years ago
Read 2 more answers
Other questions:
  • Explain why conjugate pairs must be composed of weak acids and bases.
    8·1 answer
  • Is anyone good with science?
    5·1 answer
  • Class 9 <br> Chapter: Structure of the Atom <br> What are the alpha particles compared to?Why?
    11·1 answer
  • 25.0 grams of Iron (III) oxide reacts with 30.0 grams of Silver sulfate in a double replacement reaction. Find the
    13·1 answer
  • Is table salt an example of a substance?
    14·1 answer
  • Which reactions are oxidation-reduction reactions? Check all that apply
    10·2 answers
  • Method 70<br>Seprate a mixture Containing <br>Sodium chloride, Iron fillings and Water<br>​
    12·1 answer
  • Calculate: (7.0 x 10^5) + (2.5 x 10^4) =
    5·1 answer
  • How many atoms are in TWO water (H20) molecules?
    6·2 answers
  • 18. What is assigned a rating of 3 in the yellow diamond of the NFPA 704 symbol.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!