Question
Asked Oct 21, 2019
129 views

when a 6.00 g sample of KBr is dissolved in water in calorimeter that has a total heat capacity of 3.24kJ x K^-1, the temperature decreases by 0.310 K. Calculate the molar heat of solution of KBr.

check_circle

Expert Answer

Step 1

The heat of the reaction when 6 g of KBr is dissolved can be calculated as,

help_outline

Image Transcriptionclose

Heat C x AT Heat = 3.24 kJ/K x 0.310 K Heat 1.0044 kJ

fullscreen
Step 2

Molar heat of solution is the heat produced by 1 mole of the sample. Hence the number of moles of KBr in 6 g is calculated as,

help_outline

Image Transcriptionclose

Given mass No. of moles Molecular Mass Molecular mass of KBr = 39 +80 = 119 g/mol 6 g 0.050 moles No. of moles 119 g/mol

fullscreen
Step 3

Now, 0.050 moles of KBr produces 1.0044 kJ of heat, hence the ...

help_outline

Image Transcriptionclose

1.0044 kJ Molar heat = 20.088 kJ 0.050

fullscreen

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

Science

Chemistry

Chemical Thermodynamics

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: How does the effective nuclear charge experienced by the valence electrons of an atom vary going fro...

A: Going from left to right in a period, effective nuclear charge (Zeff) approaches to Z. That means el...

question_answer

Q: A light photon with a frequency of at least 0.234 × 1016 Hz is required to split apart dinitrogen ac...

A: Given:Frequency = 0.234 × 1016 Hz = 0.234 × 1016 s−1Calculation for energy:

question_answer

Q: How to balance this equation?   Ba(ClO3)2(s) ----> BaCl2(s) + O2(s)

A: To balance the equation, number of atoms on the reactant side must be equal to number of atoms on th...

question_answer

Q: The value of Kc for the reaction below is 7.52  at 423  K.NO2​(g)N2​O4​(g)     Determine the reactio...

A: The chemical reaction involved:                     2 NO2​(g) -----------à N2​O4​(g)Given:[NO2] = 0....

question_answer

Q: An astrophysicist working at an observatory is interested in finding clouds of hydrogen in the galax...

A: The Rydberg equation is given by

question_answer

Q: I have calculated this problem wrong twice, and I could use some guidance.    Thanks much.

A: Click to see the answer

question_answer

Q: How many atoms are in one molecule of H3 PO4 ?

A: The number atoms in one molecule of H3PO4 can be observed as,

question_answer

Q: A piece of silver with mass of 20.0 g is immersed in 25.0 g of water. This system is heated electric...

A: Given:Mass of silver = 20.0 gMass of water = 25.0 gThe system is heated from 24.2 to 36.8°C.Cp silve...

question_answer

Q: Calculate the standard enthalpy change for the reaction at 25 ∘C.    C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g)

A: Enthalpy change of reaction: The enthalpy change of a reaction is roughly equivalent to the amount o...