Solid ammonium dichromate decomposes as the equationr:

$(N H_{4} 4)_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
If 63 g of sammonium dichromate decomposes, calculate:
(a) the quantity in moles of $(N H_{4})_{2} C r_{2} O_{7}$
(b) the qunatity in moles of nitrogen formed
(c) the volume of $N_{2}$ evolved at STP

(d) the loss of mass
(e) the mass of chromium (iii) oxide formed at the same time.

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Solution

$(N H_{4} 4)_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$

(a) Molecular mass of $(N H_{4} 4)_{2} C r_{2} O_{7} = 252 g$

$M o l e = \frac{g i v e n m a s s}{m o l a r m a s s} = \frac{63}{252} = 0.25$

(b) 1 mole $(N H_{4} 4)_{2} C r_{2} O_{7}$ produces 1 mole of $N_{2}$

0.25 mole $(N H_{4} 4)_{2} C r_{2} O_{7}$ produces 0.25 mole of $N_{2}$

(c) 1 mole $N_{2}$ occupies 22.4 litre

So, 0.25 mole of $N_{2}$ will occupy = $0.25 \times 22.4 = 5.6 l i t r e s$

(d)
252 g of solid ammonium dichromate decomposes to give 152 g of solid chromium oxide, so the loss in mass in terms of solid formed = 100 g
Now, if 63 g ammonium dichromate is decomposed, the loss in mass would be $= 100 \times \frac{63}{252} = 25 g$

(e) If 252 g of ammonium dichromate produces $C r_{2} O_{3} = 152 g$
So, 63 g ammonium dichromate will produce $= 63 \times \frac{152}{252} = 38 g$

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Q. Ammonium dichromate on heating decompose to form nitrogen and chromium ( lll) oxide and water what will be the loss in mass if 31.5 gram of Ammonium dichromate is heated at 100°C
(chromium=52,nitrogen=14,hydrogen=1,oxygen =16)
(NH4 )²Cr2O7 gives N2+Cr2O3+4H2O

(NH₄)₂Cr₂O₇ $\overset{}{\to}$ N₂ + Cr₂O₃ + 4H₂O. What volume of nitrogen at STP, will be evolved when 63 g of ammonium dichromate is decomposed? (H = 1, N = 14, O = 16, Cr = 52)

(N H_{4})_{2} C r_{2} O_{7} \to C r_{2} O_{3} + 4 H_{2} O + N_{2}

Calculate the volume of nitrogen at STP, evolved when 63 g of ammonium dichromate is heated.

(N H_{4})_{2} C r_{2} O_{7} h e a t \to N_{2} (g) + 4 H_{2} O (g) + C r_{2} O_{3}

The volume in litres of dm

^{3}

N_{2}

evolved when 63 gm of ammonium dichromate is heated at STP is____________. (Please give your answer in the form of nearest integer)

(N H_{4})_{2} C r_{2} O_{7} \to C r_{2} O_{3} + 4 H_{2} O + N_{2}

The mass of

C r_{2} O_{3}

formed by the decomposition of 63 gm of ammonium dichromate :

[N = 14, H = 1, O = 16, C r = 52]

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