(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)

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Solution

Let V be the volume of nitrogen evolved in litres.
Molecular mass of ammonium dichromate = [4(14) + 8(1) + 2(52) + 7(16)] g = 252 g
Number of moles in 63 g of ammonium dichromate = $\frac{63}{252} = 0.25$

According to the balanced chemical equation, one mole of dichromate decomposes to give one mole of nitrogen.
Thus, 0.25 mole of dichromate will decompose to give 0.25 mole of nitrogen.

Number of moles of nitrogen at STP = $\frac{Volume of nitrogen}{Molar volume} = \frac{V}{22.4}$
$\frac{V}{22.4} = \frac{63}{252}$

$\Rightarrow$ V = 5.6 L

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(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} \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]

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

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.

(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)

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(NH4)2Cr2O7 → 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)

(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)