 ×     #### Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Click to Chat

1800-1023-196

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
```
1 mole of a mixture of N2,NO2,N2O4 has a mean molar mass of 55.4on heating to a temperature at which all the N2O4 may be pressured to have dissociated as N2O4..... 2NO2,the mean molar mass becomes 39.6. what is the mole ratio of N2,NO2,N2O4 in original mixture

```
8 years ago

```							RLet, No. of moles of N2 = xNo. of moles of NO2 = ySo, no. of moles of N2O4 = ZSo, we get, x + y + z = 1----eq.1 Now. as ,mean average of the molar mass of all these molecules = 55.4So, we can create an equation as: Molar mass of N2 = 28 , molar mass of  NO2= 46 and Molar mass of  N2O4 = 92So, we get, [28x + 46 y + 92z ]/ [x +y +z] = 55.6or, x+y+z=1So,  28x + 46 y + 92z = 55.6.... eq.2 Further, since on heating all the N2O4 is converted to 2NO2 so moles of NO2 formed is doubled of moles of N2O4 so moles of NO2 formed= 2zhence, in new condition moles of NO2 = (y +2z)Now, mixture has x moles of N2 and (y+2z) moles of NO2 (i.e. , y moles of NO2 =46y and 2z moles of NO2 = 92z)so, the mean molar mass decreases as :[28x+ 46y + 92 z ]/ (x + y +2z) = 39.6Or, putting the value from eq.2,x + y + 2z = 55.4/39.6 = 1.39...eq.3Now we subtract  eq.1 from 3 x + y  +2z= 1.39-x  -y  -z= -1  ________________z = 0.39 = 0.4 So, x+y = 0.6 Putting the value of z in eq.2 28x + 46 y = 18.8-x     - y   = - 0.6 ] x 28________________ 18y = 2y = 2/18 =0.1hence, x = 0.6 - 0.1 = 0.5So, ratio becomes , x : y : z = 0.5 : 0.1 : 0.4 I hope, it is clear now!
```
3 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Physical Chemistry

View all Questions »  ### Course Features

• 731 Video Lectures
• Revision Notes
• Previous Year Papers
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Test paper with Video Solution  ### Course Features

• 141 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions