I would be difficult to remove an electron from a Noble or Inert Gas (also known as the group 8 or 0 elements). This is because they all have filled outermost shells and as such the outermost shell would be held tightly to the nucleus and as such make it difficult to remove. Examples Helium, Neon, Argon, Xenon, Krypton and Radon
Answer: 1008 metres
Explanation:
speed of swimmer = 2.8 m/s
Time taken = 6minutes
(since speed is in metres per second, convert time in minutes to seconds
If 1 minute = 60 seconds
6 minute = 6 x 60 = 360 seconds
distance = ?
Since, speed is the distance covered divided by time taken in seconds, thus
Speed = distance / time
Distance = speed x time taken
distance = 2.8m/s x 360
= 1008 metres
Thus, the swimmer cover a distance of 1008 metres
It is fact that
6.023
×
10
23
formula units of barium nitrate have a mass of
16.6*10^23
⋅
g
. This is what we specify when we say molar mass. And thus the mass of
5.30
×
10
22
formula units of barium nitrate is the quotient multiplied by the molar mass:
5.30
×
10
22
6.023
×
10
23
m
o
l
×
16.6*10^23
⋅
g
⋅
m
o
l
−
1