Please help me solve this I already asked this question and someone solved it incorrectly. Thank you. Solution given, concentration of NH 4 NO 2 = 1.10 M in volume = 2.20 L step1 thus, moles of NH 4 NO 2 = 1.10 x 2.20 = 2.42 moles step2 1 mole of NH 4 NO 2 can form 1 mol of N 2 2.42 moles of NH 4 NO 2 can form 2.42 moles of N 2 step3 pressure is only due to N 2 gas p = nRT / v p = 2.42 x 0.0821 x 298 / 2.20 p = 26.91 atm step4 pressure in 10 L p = nRT / v p = 2.42 x 0.0821 x 25 /10 p = 5.92 atm step5 change in pressure = 26.91 - 5.92 = 20.99 atm or (21 atm) .