MOLE CONCEPT

Question 1

12g Na converted to vapour of Na calculate g of Na

Answer 1

Mass does not change
12g

Question 2

No of protons =?
No of electrons =?
No of neutrons =?
For Co2
SO4^2-
NH4+

Answer 2

no of protons is atomic number itself
No of protons =atomicityatomic number
No of neutron =mass number-atomic numberatomicity
Co2=22 protons
22 electron
22 neutron
2………SO4^2-…..p=48;e=50

Question 3

Total charge?
10^27 ions of So4^2-

Answer 3

21.610^-19*10^27

Question 4

1 mole o2 with 2 mole oxygen then calculate total number of o2 molecule it contains
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No of moles =no of molecule/Avogadro number

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Total mole of CO2 in container? If 3.01110^23+6.02210^23 another co2

Answer 4

3*avagadro number

No of moles =no of molecule/Avogadro number

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3.01110^23/6.02210^23=0.5
6.02210^22/6.02210^23=0.1

Question 5

No of mole=mass /m wt

Mole inversely proportion to molecular weight
Mole directly proportional to no of molecule

No of mole=Pv/RT(for gas)
Vg at STP/22.4 (for gases)
+++++++++++++++++++++++++++++
Which has max molecule?
4g h2
28g N2
88g CO2
All Equal

Answer 5

No of mole=mass /m wt

Mole inversely proportion to molecular weight
Mole directly proportional to no of molecule
Both a and b

Question 6

0.14 moles of o atom is in S3O9 how many moles of S3O9?
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The number of atoms of 0.1 mole of Triatomic gas

Answer 6

No ofmole of o atom=9no of mole of molecule
0.14=9no of mole
No of mole=0.14/9

No of molecule=0.1Na3

Question 7

0.0821 atm l mol-1 k-1
8.314 Joule mol-1 k-1

Question 8

Avg atomic mass

Answer 8

Total mass/total atom

A1X1+A2X2/X1+X2
X=mass mole number

Mwt=2*VD

Mass of element/mass of compound*100

℅of element=total mass of element/mwt of comp