Answer:
L2 add a for NAL add a 2 then for the first NA2 put a 4 and then the second NA2 put a 2 and it should be good
Explanation:
First, we need to get n1 (no.of moles of water ): when
mass of water = 0.0203 g and the volume = 1.39 L
∴ n1 = mass / molar mass of water
= 0.0203g / 18 g/mol
= 0.00113 moles
then we need to get n2 (no of moles of water) after the mass has changed:
when the mass of water = 0.146 g
n2 = mass / molar mass
= 0.146g / 18 g/ mol
= 0.008 moles
so by using the ideal gas formula and when the volume is not changed:
So, P1/n1 = P2/n2
when we have P1 = 1.02 atm
and n1= 0.00113 moles
and n2 = 0.008 moles
so we solve for P2 and get the pressure
∴P2 = P1*n2 / n1
=1.02 atm *0.008 moles / 0.00113 moles
= 7.22 atm
∴the new pressure will be 7.22 atm
The scientist named J.J. Thomson discovered the electrons by cathode ray experiment
He gave the proof of electrons in the atom by his experiment in which he had used cathode ray tubes.These tubes are a source of cathode rays production. Cathode ray tubes are the glass tubes in which air is absent and in order to maintain this, sealing is done at the ends of the rods.
He took two electrodes, anode (with positive charge) and cathode (with negative charge). There was a high voltage across them, which caused a beam of particles to flow from cathode to anode. These rays can be detected by screening them onto phosphor film(photo sensitive material) which is a was set up far away from the anode. The phosphor emits light when they comes in contact with the cathode rays.
In order to test the properties of the particles, he used two oppositely-charged electric plates around the cathode ray.
He observed that the cathode rays were repelled away from the negatively-charged electric plate and attracted towards the positively-charged plate and by which he concluded that the cathode rays were composed of negatively-charged particles which were named as electrons (subatomic particle).