The transformation occuring in Duma's method is given below
`C_(7)H_(7)N + (2x + (y)/(2))CuO rarr x CO_(2) + (y)/(2)H_(2)O + (z)/(2)N_(2) + (2x + (y)/(2))Cu`
The value of y is ___________. (Integer answer)

Estimation of Nitrogen: There are two methods for the estimation of nitrogen (1) Dumas method and (2) Kjedahl's method. (1) Duma's method: A known mass of compound is heated with copper oxide (CuO) in an atmosphere of CO_(2) , which gives free nitrogen along with CO_(2) and H_(2)O . C_(x)H_(y)N_(z)+(2x+(y)/(2))CuO rarr xCO_(2) +(y)/(2)(H_(2)O)+(z)/(2)+(2x+(y)/(2))Cu. The gaseous mixture is passed over a heated copper gauze which converts traces of nitrogen oxides formed of N_(2) .The gaseous mixture is collected over an aqueous solution of KOH which absorbs CO_(2) and nitrogen is collected in the upper part of the graduated tube. (2) kjeldahl's method: A known mass of organic compound (0.5 gm) is mixed with K_(2)SO_(4) (10 gm) and CuSO_(4) (1.0 gm) or a drop of mercury (Hg) and conc. H_(2)SO_(4) (25 ml) , and heated in Kjeldahl's flask. CuSO_(4) or Hg acts as a catalyst , while K_(2)SO_(4) raises the boiling point of H_(2)SO_(4) . The nitrogen in the organic compound is quantitatively converted to ammonium sulphate . The resulting mixture is then distilled with excess of NaOH solution and the NH_(3) evolved is passes into a known but excess volume of standard HCl or H_(2)SO_(4) . The acid left unused is estimated by titration with some standard alkali . The amound of acid used against NH_(3) can thus be known and from this the percentage of nitogen is calculated. (a) C+H +S underset(H_(2)SO_(4))overset("conc.")rarr CO_(2) + H_(2)O +SO_(2) (b) N underset(H_(2)SO_(4))overset("conc.")rarr (NH_(4))_(2)SO_(4) (c) (NH_(4))_(2)SO_(4)+2NaOH rarr Na_(2)SO_(4)+2NH_(3) + 2H_(2)O (d) 2NH_(3) + H_(2)SO_(4) rarr (NH_(4))_(2)SO_(4) (3) This method is not applicable to compounds containing N in nitro and azo groups,and N persent in the ring (e.g., pyridine as N of these conpounds does not change to (NH_(4))_(2)SO_(4) (ammonium sulphate ) under these reaction condition. 0.30 gm of an organic compound gave 50 ml of nitrogen collected at 300K and 715 mm pressure in water or Duma's method . Calculate the percentage of nitrogen in the compound . (Vapour pressure of aqueous tension of water at 300k is 15 mm)

Estimation of Nitrogen: There are two methods for the estimation of nitrogen (1) Dumas method and (2) Kjedahl's method. (1) Duma's method: A known mass of compound is heated with copper oxide (CuO) in an atmosphere of CO_(2) , which gives free nitrogen along with CO_(2) and H_(2)O . C_(x)H_(y)N_(z)+(2x+(y)/(2))CuO rarr xCO_(2) +(y)/(2)(H_(2)O)+(z)/(2)+(2x+(y)/(2))Cu. The gaseous mixture is passed over a heated copper gauze which converts traces of nitrogen oxides formed of N_(2) .The gaseous mixture is collected over an aqueous solution of KOH which absorbs CO_(2) and nitrogen is collected in the upper part of the graduated tube. (2) kjeldahl's method: A known mass of organic compound (0.5 gm) is mixed with K_(2)SO_(4) (10 gm) and CuSO_(4) (1.0 gm) or a drop of mercury (Hg) and conc. H_(2)SO_(4) (25 ml) , and heated in Kjeldahl's flask. CuSO_(4) or Hg acts as a catalyst , while K_(2)SO_(4) raises the boiling point of H_(2)SO_(4) . The nitrogen in the organic compound is quantitatively converted to ammonium sulphate . The resulting mixture is then distilled with excess of NaOH solution and the NH_(3) evolved is passes into a known but excess volume of standard HCl or H_(2)SO_(4) . The acid left unused is estimated by titration with some standard alkali . The amound of acid used against NH_(3) can thus be known and from this the percentage of nitogen is calculated. (a) C+H +S underset(H_(2)SO_(4))overset("conc.")rarr CO_(2) + H_(2)O +SO_(2) (b) N underset(H_(2)SO_(4))overset("conc.")rarr (NH_(4))_(2)SO_(4) (c) (NH_(4))_(2)SO_(4)+2NaOH rarr Na_(2)SO_(4)+2NH_(3) + 2H_(2)O (d) 2NH_(3) + H_(2)SO_(4) rarr (NH_(4))_(2)SO_(4) (3) This method is not applicable to compounds containing N in nitro and azo groups,and N persent in the ring (e.g., pyridine as N of these conpounds does not change to (NH_(4))_(2)SO_(4) (ammonium sulphate ) under these reaction condition. 0.50 gm of an organic compound was treated according to Kjedahl's method . The ammonia evolved was absorbed in 50 ml of (M)/(2) NaOH solution. Find the percentage of nitrogen in the compound.

Estimation of Nitrogen: There are two methods for the estimation of nitrogen (1) Dumas method and (2) Kjedahl's method. (1) Duma's method: A known mass of compound is heated with copper oxide (CuO) in an atmosphere of CO_(2) , which gives free nitrogen along with CO_(2) and H_(2)O . C_(x)H_(y)N_(z)+(2x+(y)/(2))CuO rarr xCO_(2) +(y)/(2)(H_(2)O)+(z)/(2)+(2x+(y)/(2))Cu. The gaseous mixture is passed over a heated copper gauze which converts traces of nitrogen oxides formed of N_(2) .The gaseous mixture is collected over an aqueous solution of KOH which absorbs CO_(2) and nitrogen is collected in the upper part of the graduated tube. (2) kjeldahl's method: A known mass of organic compound (0.5 gm) is mixed with K_(2)SO_(4) (10 gm) and CuSO_(4) (1.0 gm) or a drop of mercury (Hg) and conc. H_(2)SO_(4) (25 ml) , and heated in Kjeldahl's flask. CuSO_(4) or Hg acts as a catalyst , while K_(2)SO_(4) raises the boiling point of H_(2)SO_(4) . The nitrogen in the organic compound is quantitatively converted to ammonium sulphate . The resulting mixture is then distilled with excess of NaOH solution and the NH_(3) evolved is passes into a known but excess volume of standard HCl or H_(2)SO_(4) . The acid left unused is estimated by titration with some standard alkali . The amound of acid used against NH_(3) can thus be known and from this the percentage of nitogen is calculated. (a) C+H +S underset(H_(2)SO_(4))overset("conc.")rarr CO_(2) + H_(2)O +SO_(2) (b) N underset(H_(2)SO_(4))overset("conc.")rarr (NH_(4))_(2)SO_(4) (c) (NH_(4))_(2)SO_(4)+2NaOH rarr Na_(2)SO_(4)+2NH_(3) + 2H_(2)O (d) 2NH_(3) + H_(2)SO_(4) rarr (NH_(4))_(2)SO_(4) (3) This method is not applicable to compounds containing N in nitro and azo groups,and N persent in the ring (e.g., pyridine as N of these conpounds does not change to (NH_(4))_(2)SO_(4) (ammonium sulphate ) under these reaction condition. 0.4 gm of an organic compound was treated according to Kjeldahl's method .The ammonia evloved was absorbed in 50 ml of 0.5 M H_(3)PO_(3) .The residual acid required 30 ml of 0.5 M Ca(OH)_(2) . Find the percentage of N_(2) in the compound .

Estimation of Nitrogen: There are two methods for the estimation of nitrogen (1) Dumas method and (2) Kjedahl's method. (1) Duma's method: A known mass of compound is heated with copper oxide (CuO) in an atmosphere of CO_(2) , which gives free nitrogen along with CO_(2) and H_(2)O . C_(x)H_(y)N_(z)+(2x+(y)/(2))CuO rarr xCO_(2) +(y)/(2)(H_(2)O)+(z)/(2)+(2x+(y)/(2))Cu. The gaseous mixture is passed over a heated copper gauze which converts traces of nitrogen oxides formed of N_(2) .The gaseous mixture is collected over an aqueous solution of KOH which absorbs CO_(2) and nitrogen is collected in the upper part of the graduated tube. (2) kjeldahl's method: A known mass of organic compound (0.5 gm) is mixed with K_(2)SO_(4) (10 gm) and CuSO_(4) (1.0 gm) or a drop of mercury (Hg) and conc. H_(2)SO_(4) (25 ml) , and heated in Kjeldahl's flask. CuSO_(4) or Hg acts as a catalyst , while K_(2)SO_(4) raises the boiling point of H_(2)SO_(4) . The nitrogen in the organic compound is quantitatively converted to ammonium sulphate . The resulting mixture is then distilled with excess of NaOH solution and the NH_(3) evolved is passes into a known but excess volume of standard HCl or H_(2)SO_(4) . The acid left unused is estimated by titration with some standard alkali . The amound of acid used against NH_(3) can thus be known and from this the percentage of nitogen is calculated. (a) C+H +S underset(H_(2)SO_(4))overset("conc.")rarr CO_(2) + H_(2)O +SO_(2) (b) N underset(H_(2)SO_(4))overset("conc.")rarr (NH_(4))_(2)SO_(4) (c) (NH_(4))_(2)SO_(4)+2NaOH rarr Na_(2)SO_(4)+2NH_(3) + 2H_(2)O (d) 2NH_(3) + H_(2)SO_(4) rarr (NH_(4))_(2)SO_(4) (3) This method is not applicable to compounds containing N in nitro and azo groups,and N persent in the ring (e.g., pyridine as N of these conpounds does not change to (NH_(4))_(2)SO_(4) (ammonium sulphate ) under these reaction condition. 0.002 gm of an organic compound was treated according to Kjeldahl's method . 0.2 xx 10^(-4) mol of H_(2)SO_(4) was required to neutralise NH_(3) . Calculated the percentage of N.

Consider the following reaction x MnO_(4)^(-) + C_(2)O_(4)^(2-) + zH^(+) rarr x Mn^(2+) + 2y CO_(2) + (z)/(2)H_(2)O The value of x, y and z in the reaction are respectively

For the given redox reaction x KMnO_(4) +y H_(2)O_(2) +z H_(2)SO_(4) rarr p MnSO_(4) +10 O_(2(d)) + q K_(2)SO_(4) +r H_(2)O Calculate value of (x+z-p)

Be_(2)C+H_(2)O rarr BeO+X CaC_(2)+H_(2)O rarr Ca(OH)_(2)+Y M_(2)C_(3)+H_(2)O rarr Mg(OH)_(2)+Z X,Y and Z are respectively:

The equation Cu + XHNO_(3) to Cu(NO_(3)) + Y NO_(2) + 2H_(2)O the values of X and Y are