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  • Need clarity, kindly explain! For per gram of reactant, the maximum quantity of N 2 gas is produced in which of the following thermal decomposition reactions ?(Given : Atomic wt. - Cr=52 u, Ba=137 u)

For per gram of reactant, the maximum quantity of N 2 gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic wt. - Cr=52 u, Ba=137 u)

  • Option 1)

    (NH_{4})_{2}Cr_{2}O_{7}_{(s)} \rightarrow N_{2}_{(g)} + 4H_{2}O_{(g)}

  • Option 2)

    2NH_{4}NO_{3}_{(s)} \rightarrow 2N_{2}_{(g)} + 4H_{2}O_{(g)} + O_{2}_{(g)}

  • Option 3)

    Ba(N_{3})_{2}_{(s)} \rightarrow Ba_{(s)} + 3N_{2}_{(g)}

  • Option 4)

    2NH_{3(g)} \rightarrow N_{2(g)} + 3H_{2(g)}

 

Answers (2)

As we learnt

 

Stoichiometry -

Stoichiometry deals with measurements of reactants and products in a chemical reaction.

- wherein

aA (g) + bB (g) → cC (g) + dD (g)

Here, ‘a’ moles of A(g) reacts with ‘b’ moles of B(g) to give ‘c’ mole of C(g) and ‘d’ moles of D(g)

 

 Per Gram (NH4)2Cr2O7 gives  \frac{28}{252} = 0.11  gram of N2

 Per Gram (NH4)2NO3 gives  \frac{28}{80} = 0.35  gram of N2

 Per Gram Ba(N3)2 gives  \frac{84}{221} = 0..38  gram of N2

 Per Gram NH3 gives  \frac{28}{34} = 0.82  gram of N2

NH3 gives Highest N2.


Option 1)

(NH_{4})_{2}Cr_{2}O_{7}_{(s)} \rightarrow N_{2}_{(g)} + 4H_{2}O_{(g)}

Option 2)

2NH_{4}NO_{3}_{(s)} \rightarrow 2N_{2}_{(g)} + 4H_{2}O_{(g)} + O_{2}_{(g)}

Option 3)

Ba(N_{3})_{2}_{(s)} \rightarrow Ba_{(s)} + 3N_{2}_{(g)}

Option 4)

2NH_{3(g)} \rightarrow N_{2(g)} + 3H_{2(g)}

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Vakul

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