How many grams of nitrogen will be produced in a reaction between ammonia and dinitrogen monoxide in which the total heat energy released was 505 KJ?

2 NH3 + 3 N2O = 4 N2 + 3 H2O DELTA Hrxn= ?
Given:
4 NH3 + 3 O2 = 2 N2 + 6 H2O DELTA Hrxn= -1556KJ
N2O + H2 = N2 + H2O DELTA Hrxn= -389.4 KJ
H2+ ½ O2 = H2O DELTA Hrxn= -223.9 KJ

55.5g of N₂

Explanation:

It is possible to find ΔH of a reaction by the sum of half-reaction (Hess's law), thus:

(1) 4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O ΔH= -1556KJ

(2) N₂O + H₂ → N₂ + H₂O  ΔH= -389.4 KJ

(3) H₂+ ½ O₂ → H₂O  ΔH= -223.9 KJ

(4) = 1/2 (1) + 3 (2):

(4) 2 NH₃ + 3 N₂O +3 H₂ + ³/₂ O₂ → 4 N₂ + 6 H₂O

ΔH = 1/2 (-1556kJ) + 3 (-389.4kJ) = -1946.2kJ

(4) - 3(3):

2 NH₃ + 3 N₂O → 4 N₂ + 3 H₂O ΔH = -1946.2kJ - 3 (-223.9 KJ)

ΔH = -1274.5 kJ

As when 5 moles of nitrogen are produced there are released 1274.5kJ, when are released 505kJ:

505kJ × (5 moles N₂ / 1274.5kJ) = 1.98 moles of N₂. In mass:

1.98moles N₂ ₓ (28g / 1mol) = 55.5g of N₂

the dependant variable is spilled water

the independent is the heat

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.