Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

P2O5 on treatment with excess H2O followed by excess of NH4OH form (NH4)2HPO4. If 100 g of (NH4)2HPO4 is formed then find out the mass of P2O5 initially taken 

Asked by Anil | 11 May, 2017, 12:04: PM
answered-by-expert Expert Answer
Balanced equations:
    P2O5 + 3H2O  → 2 H3PO -------  (I)  
    H3PO4 (aq) + 2 NH4OH (aq) → (NH4)2HPO4 (s)+ 2H2O    ---------  (II)
 
1 mole of P2O5 (Phosphorus Pentoxide) with excess water gives 2 moles of Phosphoric acid H3PO4.    
1 mole of Phosphoric acid in excess of Ammonium Hydroxide, produces 1 mole of (NH4)2HPO4 salt (s) and water.

Molecular weight of P2O5  = 142
Molecular weight of (NH4)2HPO4  = 132
 
Multiply the equation (II) by a factor of 2 we get  
4NH4OH + 2H3PO4 → 2(NH4)2HPO4 + 4H2O …………….(III)
Combining equations (I) & (III) 
P2O5 + 4NH4OH → 2(NH4)2HPO4 + H2O ……………………(IV)
From equation (IV) 1 mole of P2O5 (142g) gives 2 moles of (NH4)2HPO4 (264 g) on hydration followed by neutralisation with excess of NH4OH.
Mass of P2O5 required to produce 100 g of (NH4)2HPO4 = 142(100)/264 = 53.79 g 


Answered by Prachi Sawant | 11 May, 2017, 05:00: PM
CBSE 11-science - Chemistry
Asked by Jprmumal29 | 18 Dec, 2022, 09:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by mallikarjunasangi28 | 22 Jul, 2022, 07:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by vedwatisharma79 | 10 Jun, 2022, 05:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by thathvakunjusree | 10 Dec, 2021, 06:46: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by udheshraddha2004 | 28 Oct, 2021, 09:37: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by arunparewa2000 | 27 Oct, 2021, 06:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by arttameher038 | 23 Aug, 2021, 07:06: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by ishaansax007 | 07 Jun, 2021, 04:36: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by ebinoji | 20 Dec, 2020, 06:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×