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
tankabanditka [31]
3 years ago
5

An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron? A. 450.00

B. 145.80 C. 158.77 D. 490.05
I am looking for an ABC or D not a long list of explanations
Chemistry
1 answer:
valkas [14]3 years ago
6 0

Answer:

  • <u>Option A. 450.00</u>

Explanation:

<u>1) Data:</u>

a) m = 18 kg

b) T₁ = 285 K

c) T₂ = 318 K

d) Q = 267.3 kJ

e) S = ?

<u>2) Principles and equations</u>

The specific heat of a substance is the amount of heat energy absorbed to increase the temperature of certain amount (gram, kg, or moles, depending on the definition or units) of the substance in 1 ° C or 1 K.

The mathematical relation between the specific heat and the heat energy absorbed is:

  • Q = m × S × ΔT

Where,

  • Q is the heat absorbed,
  • S is the specific heat, and
  • ΔT is the temperature increase (T₂ - T₁)

<u>3) Solution:</u>

<u>a) Substitute the data into the equation:</u>

  • 267.3 kJ = 18 kg × S × (318 K - 285 K)

<u>b) Solve for S and compute:</u>

  • S = 267.3 kJ / (18 kg × 33 K) = 0.45 kJ / (Kg . K)

The options have not units, but I notice that the first answer is 1,000 times the answer I obtained, so I will make a conversion of units.

<u>c) Convert to J /( kg . k):</u>

  • 0.45 kJ / (Kg . K) × 1,000 J / kJ = 450 J / (kg . K)

Now we can see that the option A is is the answer, assuming the units.

You might be interested in
Using the model of the Periodic Table, which two elements pictured have similar chemical properties?
liberstina [14]

Answer:

C) 1 and 3

Explanation:

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. ... Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.

5 0
3 years ago
Wat happens when water is added to a sand-salt mixture ?
aalyn [17]

Answer:

salt will dislove sand wont

Explanation:

3 0
2 years ago
PLEASE HELP!!
Musya8 [376]

Rubidium is a alkali metal.

4 0
3 years ago
Read 2 more answers
How did Neils Bohr change the model of the atom
kipiarov [429]
Bohr changed the model of the atom by proposing that electrons travelled in circular orbits with specific energy levels.
6 0
2 years ago
If the boron nitride molecule, bn, were to form, what would its structure look like? add bonds and lone pairs as necessary.
Bess [88]

Answer: The structure for the boron nitride molecule will be linear.

Explanation: When boron and nitrogen combine together to form a compound, the boron element will loose 3 electrons which will be easily accepted by the nitrogen element.

Boron : Atomic number is 5

Electronic configuration: 1s^22s^22p^1

To attain stable configuration, boron will loose 3 electrons easily.

Nitrogen : Atomic number is 7

Electronic configuration: is^22s^22p^3

To attain stable configuration. nitrogen will gain 3 electrons easily.

Hence, to form a molecule with these two elements, there will be 3 bonds present in between them and 1 pair of lone pair will be left on the nitrogen atom.

Structure of boron nitride ( which is linear) is attached in the image below.

8 0
3 years ago
Other questions:
  • A gas mixture contains 10.0 mole% H2O (v) and 90.0 mole % N2. The gas temperature and absolute pressure at the start of each of
    9·1 answer
  • In a car cylinder, a piston moves up and down inside a cylinder, causing the substance inside to expand and contract. Which type
    5·1 answer
  • Proporties of mixtures
    11·2 answers
  • 10 points
    7·1 answer
  • Balance this equation: CH4 +2O2--------&gt; ___ CO2 + ___ H2O
    15·1 answer
  • Provide examples of newtons laws of motion. (laws one two n three)
    7·1 answer
  • Can the same fertilizer be applied to all types of soil ? Explain​
    9·1 answer
  • Any change in average weather conditions on Earth that lasts for at least several decades is called
    15·1 answer
  • If 75.6 grams of iron has a Volume of 250 ml. What is the density of Iron?
    5·1 answer
  • 3. The reaction between equimolar solutions of silver nitrate and sodium chloride is shown
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!