B would be the answer for this question
Answer:
The option D is correct answer.
Answer: -1835 kJ
Explanation:
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
(1)
(2)
Net chemical equation:
(3)
Multiplying equation (1) by 4, and reversing we get
(4)
Adding (2) and (4)
Thus enthaply change for the reaction is -1835 kJ.
The percentage composition of Nitrogen in the compound is 35.71%
<h3>How to determine the mole of nitrogen</h3>
- Volume (V) = 100 mL = 100 / 1000 = 0.1 L
- Pressure (P) = 700 mmHg
- Temperature (T) = 250 K
- Gas constant (R) = 62.364 torr.L/Kmol
- Number of mole (n) =?
Using the ideal gas equation, the mole of nitrogen can be obtained as follow
PV = nRT
n = PV / RT
n = (700 × 0.1) / ( 62.364 × 250)
n = 0.00448 mole
<h3>How to determine the mass of nitrogen</h3>
- Mole of nitrogen = 0.00448 mole
- Molar mass of nitrogen = 28 g/mol
- Mass of nitrogen = ?
Mass = mole × molar mass
Mass of nitrogen = 0.00448 × 28
Mass of nitrogen = 0.125 g
<h3>How to determine the percentage of nitrogen</h3>
- Mass of nitrogen = 0.125 g
- Mass of compound = 0.35 g
- Percentage of nitrogen =?
Percentage = (mass of element / mass of compound) × 100
Percentage of nitrogen = (0.125 / 0.35) × 100
Percentage of nitrogen = 35.71%
Learn more about mass composition:
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Surface over which the air mass was formed.
