Question

Molar specific heat of Helium at constant volume at 12.60J/mole. K. Find its molar specific heat at constant pressure
A. 20.91J/mele K
B. 209.1J/mole K
C. 2.09 1/mole K
D.J 20913/mole K
​

Answer 1

Answer:(A)

Explanation:CP/CV =1.66 (for monoatomic gas)

CP/12.6 = 1.66

CP = 1.66× 12.6 = 20.91 J/molk

Answer 2

$\bigstar$ Given

Molar specific heat of Helium at constant volume at 12.60 J/mole K

$\bigstar$ To Find

Its molar specific heat at constant pressure

$\bigstar$ Solution

We know that

$\red{\rm\longrightarrow C_{p}=C_{v}+R}$

Here

$\rm C_{p}$ = specific heat coefficient at constant pressure

$\rm C_{v}$ = specific heat coefficient at constant volume

R = gas constant

According to the question

We are asked to find its molar specific heat at constant pressure

Therefore

We must find $\rm "C_{p}"$

Given that

Molar specific heat of Helium at constant volume at 12.60 J/mole K

Hence

• $\rm C_{v}$ = 12.60 J/mole K

We know that

• R = 8.314 J/mole K

Substituting the values

We get

$\orange{\rm\longrightarrow C_{p}=12.60+8.314 \ J/mole \ K}$

Therefore

$\pink{\rm\longrightarrow C_{p}=20.91 \ J/mole \ K}$

Hence

$\checkmark$ Option (A) is correct