Image is unclear if rotated. 08 Question point) a See page 457 In some aquatic e

Question

Image is unclear if rotated.

08 Question point) a See page 457 In some aquatic ecosystems, nitrate (NO3) is converted to nitrite (NO2 ), which then decomposes to nitrogen and water. As an example of this second reaction, consider the decomposition of ammonium nitcite NH4NO2(aq) N2(g) + 2H2O(1) 1st attempt Feedback See Periodic Table See Hint What would be the change in pressue in a sealed 100 L vessel due to the formation of N2 gas when the ammoniunm nitrite in 2.40 L of 0.700 M NH4NO2 decomposes at 25.0°C? 0 atm

Explanation / Answer

Vessel volume V = 10 L

Moles of ammonium nitrite = volume x molarity

= 2.4 L x 0.7 mol/L = 1.68 mol

From the stoichiometry of the reaction

Moles of N2 gas formed = Moles of ammonium nitrite = 1.68 mol

Temperature T = 25 + 273 = 298 K

From the ideal gas equation

PV = nRT

P = nRT / V

= 1.68*0.0821*298/10

P = pressure due to the formation of the N2 gas = 4.11 atm

Atmospheric pressure = 1 atm

Change in pressure = 4.11 - 1 = 3.11 atm

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