Asked Nov 19, 2019

How much energy is lost when 50 g of iron cools from 45°C to 15°C? (specific heat capacity of iron = 460 Jkg-1K-1)


Expert Answer

Step 1

The relation between the amount of heat gained or lost (q) by a metal in a chemical process and the specific heat (s) of metal is given in expression (1). In this expression, m is the mass of the metal, s is the specific heat, T1 is the final temperature, and T2 is the final temperature.

q ms(T-T)

Image Transcriptionclose

q ms(T-T) (1)

Step 2

The specific heat capacity of iron can be converted into J/g0C as,

1 J/kgK 0.001 J/g°C
460 J/kgK 0.001x 460 J/g°C
0.460 J/g°C

Image Transcriptionclose

1 J/kgK 0.001 J/g°C 460 J/kgK 0.001x 460 J/g°C 0.460 J/g°C

Step 3

The amount of heat released by iron is ...

q50 gx 0.460 J/g°C(15-45) °C
=-690 J

Image Transcriptionclose

q50 gx 0.460 J/g°C(15-45) °C =-690 J


Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in



Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add

Q: what is the balanced net ionic equation for the reaction between the water insoluble solid Mg(OH2) (...

A: The balanced net ionic equation for the reaction between the water insoluble solid Mg(OH)2 (s) and a...


Q: If the density of water is 1.0 g/ml . How is the density of ice different from water when both are m...

A: Density is a physical quantity that can be determined with the help of the mass and volume of the gi...


Q: Qs2. You are given two similar looking white, organic crystalline solids and determine their melting...

A: Given information:The two organic compounds are similar in nature and melting points of first and se...


Q: Consider these reactions, where M represents a generic metal. 2M(s)+6HCl(aq)⟶2MCl3(aq)+3H2(g)ΔH1=−...

A: The given reaction is,


Q: A 100.0 mL solution of NaOH reaches the equivalence point when 39.79 mL of a 0.0300 M solution of HC...

A: GivenVolume of NaOH= 100.0mLVolume of HCl= 39.79 mLMolarity of HCl= 0.03M


Q: Calculate the value of the rate constant K round your answer to two significant digits also be sure ...

A: The zero-order, first-order, and second-order reaction follows the equation (1), (2), and (3) respec...


Q: What is the LUMO of the Li₂ molecule? please explain with answer...don't quite understand book expla...

A: Click to see the answer


Q: Combustion of hydrocarbons such as butane (C4H10) produces carbon dioxide, a "greenhouse gas." Green...

A: The balanced chemical equation for combustion of butane is given in step 2.


Q: Consider the chemical equation. N(g) + NO(g) = NNO(g) Write Lewis formulas for the reactant and prod...

A: Lewis dot structure:Structure of the molecule is depicting the atoms with bonds and lone pair of ele...