In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. What is the percentage of nitrogen in the organic compound? (Aqueous tension at 300 K is 15 mm)

0.53 g of an organic compound (x) of formula CxHyBrz when heated with excess concentrated nitric acid and then with silver nitrate gave 0.75 g of silver bromide precipitate. 1.0 g of (x) gave 1.32 g of CO2 gas on combustion. The percentage of hydrogen in the compound (x) is ________ %. (Molar mass in g mol-1: H : 1, C : 12, Br : 80, Ag : 108, O : 16)

'x' mg of an organic compound was analysed by Kjeldahl's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H2SO4. The unused acid required 60 mL of 0.5 M NaOH solution for complete neutralisation. If the percentage of nitrogen in the compound is 56%, then the value of 'x' is: