Answer:
Science...Only the form changes.Kinetic energy changes.
Explanation:
SCIENCE
Answer:
4NH₃ + 5O₂ → 4NO + 6H₂O ΔH = -904 kj
Explanation:
Given data:
Energy evolved when one mole of NH₃ react = 226 kj
Energy evolved when 4 mole of NH₃ react = ?
Solution:
Chemical equation:
4NH₃ + 5O₂ → 4NO + 6H₂O
It is stated in question that when one mole of ammonia react 226 kj energy evolved.
When 4 moles react energy evolved is,
1 mol = -226 kj
4 mol × -226 kj / 1mol
-904 kj
when 4 moles of ammonia react 904 kj energy is evolved.
Complete thermal equation:
4NH₃ + 5O₂ → 4NO + 6H₂O ΔH = -904 kj
some things i know that may helpp are these High ionization energies.
High electronegativities.
Poor thermal conductors.
Poor electrical conductors.
Brittle solids—not malleable or ductile
Answer:
Correct option : B
Explanation:
First compare
with ![OF_2](https://tex.z-dn.net/?f=OF_2)
there are two lone pair in
but only one lone pair presen in the
so more lone pair means more repulsion and hence less bond bond angle beacuse of lone pair repulsion bonded atom come closer and hence bond angle decreased .
bond angle inversely proporional to repulsion so more repulsion means less bond angle
![bond \, angle \, : OF_2 \textless PF_3](https://tex.z-dn.net/?f=bond%20%5C%2C%20angle%20%5C%2C%20%3A%20%20%20%20OF_2%20%5Ctextless%20PF_3)
does no exist it exist only in the form of
and here assuming
because in case of
difficult to compare bond angle because here two different type of bond angle is present.
![Compare \, PF_3 \, and \, PF_4^+](https://tex.z-dn.net/?f=Compare%20%5C%2C%20PF_3%20%5C%2C%20and%20%5C%2C%20PF_4%5E%2B)
there is no lone pair in the
so here will no be any repulsion and hence bond will be more in
as compared to ![PF_3](https://tex.z-dn.net/?f=PF_3)
![bond \, angle \, : PF_3 \textless PF_4^+](https://tex.z-dn.net/?f=bond%20%5C%2C%20angle%20%5C%2C%20%3A%20%20%20%20PF_3%20%5Ctextless%20PF_4%5E%2B)
![bond \, angle \, : OF_2 \textless PF_3 \textless PF_4^+](https://tex.z-dn.net/?f=bond%20%5C%2C%20angle%20%5C%2C%20%3A%20%20%20%20OF_2%20%5Ctextless%20PF_3%20%5Ctextless%20PF_4%5E%2B)