Iron + fluorine --> iron fluoride
Answer:
<u>One lone-Pair is present in Ammonia</u>
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Explanation:
The number of valence electron in N = 5
The number of Valence electron in H = 1
The formula of ammonia = NH3
Total valence electron in ammonia molecule = 5 +3(1) = 5+3 = 8
The lewis structure suggest that :
Nitrogen completes its octet by sharing the electron pair with 3 hydrogen atoms.
3 electron of Nitrogen are involved in sharing with Hydrogen
So,<u><em> remaining two electron are left non-bonded</em></u> . Hence they exist as lone- pair
So, there is only 1 lone pair in the ammonia molecule .
The shape of NH3 is bent according to VSEPR theory . This is so because the presence of 1 lone pair causes more repulsion and occupy more space.
Thus the lone pair is changing the shape of the ammonia molecule . It also increase the dipole moment of the molecule , which gives polarity to it.
Answer:
V2= 625 cm^3
Explanation:
P1 × V1 = P2 × V2
P1 (initial pressure)=125 kPa
V1 ( initial volume)= 450 cm^3
P2 (final pressure)=90kPa
V2 (final volume)= ?
Rearrange the equation to make V2 the subject, since it is the value we are trying to find
V2=(P1 × V1)/P2
V2= (125 ×450)/90
V2= 625 cm^3