Answer:
The answer to your question is: ΔH = 1637.8
Explanation:
Hess' law: This law states that the enthalpy change can be calculated even if it is not calculated directly.
"if a chemical change takes place by several routes, the overall enthalpy change is the same regardless the route".
Process
A) N2(g)+O2(g)—->2NO(g) Δ H= -180.5
B) N2(g) + 3H2(g) ——> 2NH3(g) Δ H= -91.8
C)2H2(g)+ O2(g) —-> 2H2O(g) Δ H= -486.6
The result must be:
4NH3(g)+5O2(g)—->4NO(g)+6H2O(g)
Turn letter B and multiply it by 2
4NH3 ⇒ 2N2 + 6H2 ΔH = 183.6
Multiply letter A by 2
2N2 + 2O2 ⇒ 4 NO ΔH = -361
Multiply letter C by 3
6H2 + 3O2 ⇒ 6H2O ΔH = -1459.8
Finally we add the equations up and simplify then:
4NH3 + 5O2 ⇒ 4NO + 6 H2O
And we add the ΔH = 183.6 - 361 - 1459.8
= -1637.8
Answer:
Gas:
- No fixed shape or volume
- Molecules are very loosely packed
- Flows in all the directions
Liquid:
- No fixed shape but has volume
- Molecules are closely packed
- Always flows from higher to lower level
False, in all methods of charge transfer, friction, conduction, and induction, they all require at least contact between the objects.
The answer to this question would be: alkaline earth metal
Alkali earth metal is the second column group of the periodic table. In this group, the element has 2 extra electrons in their outer cells. That is why most of this metal has 2+ charge.
Their neighbor is the alkali metal which was the first column of the periodic table. The name is similar so don't confused and mix them each other.
