The answer is. :
nitrogen has 1s2 2s2 2p3 electronic configuration... it still needs 3e' to get octet structure and become stable.. hence valency=3.
Answer is: mass of ammonia is 34 grams.
Chemical reaction: 4NH₃ + 7O₂ → 4NO₂ + 6H₂O.
N(O₂) = 2,1·10²⁴.
n(O₂) = N(O₂) ÷ Na.
n(O₂) = 2,1·10²⁴ ÷ 6·10²³ 1/mol.
n(O₂) = 3,5 mol.
From chemical reaction: n(O₂) : n(NH₃) = 7 : 4.
n(NH₃) = 2 mol.
m(NH₃) = n(NH₃) · M(NH₃).
m(NH₃) = 2 mol · 17 g/mol.
m(NH₃) = 34 g.
The percent yield of the reaction between ammonia gas with oxygen gas is 90.52%.
A chemical reaction between ammonia gas (NH3) with oxygen gas (O2)
NH₃ + O₂ → NO₂ + H₂O
The balanced reaction 4NH₃ + 7O₂ → 4NO₂ + 6H₂O
Calculate the number of moles from the reactant
- Ammonia gas
Molar mass N = 14 gr/mol
Molar mass H = 1 gr/mol
Molar mass NH₃ = 14 + (3 × 1) = 14 + 3 = 17 gr/mol
mass = 28.5 grams
n = m ÷ molar mass = 28.5 ÷ 17 = 1.68 mol - Oxygen gas
Molar mass O = 16 gr/mol
Molar mass O₂ = 16 × 2 = 32 gr/mol
mass = 83.4 grams
n = m ÷ molar mass = 83.4 ÷ 32 = 2.61 mol - n O₂ ÷ coefficient O₂ = 2.61 ÷ 7 = 0.37
n NH₃ ÷ coefficient NH₃ = 1.68 ÷ 4 = 0.42
0.42 > 0.37 it means that the ammonia gas is in excess and the O₂ is limiting.
According to stoichiometry, the number of moles NO₂ with the number of moles O₂ has the ratio with the coefficient in reaction.
- Theoretically the number moles of NO₂
n O₂ : n NO₂ = 7 : 4
2.61 : n NO₂ = 7 : 4
n NO₂ = 4 x 2.61 : 7 = 1.49 mol - The actual number of moles NO₂
Molar mas NO₂ = 14 + (16 × 2) = 14 + 32 = 46 gr/mol
n NO₂ = m ÷ molar mass = 61.9 ÷ 46 = 1.35 mol
The percent yield NO₂ is the ratio of the actual number of moles NO₂ with the theoretical number of moles NO₂ times 100%.
P = (1.35 ÷ 1.49) × 100%
P = 0.9052 × 100%
P = 90.52%
Learn more about stoichiometry here: brainly.com/question/13691565
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The false statement is C. According to the Heisenburg uncertainty principle, which inspired the modern 'Electron Cloud' model of the atom, it is nearly impossible to predict an electron's path around the atom. The model statement C is referring to is the Neils Bohr model of the atom, which is useful, but inaccurate.