Question

fill missing data in table

Answer 1

Answer :
(a) No of H2O particles:
No of moles = 2
1 mole = 6.022 x 1023
Thus, 2 moles of H2O = 2 X 6.022 x 1023 = 12.044 x 1023 particles
(b) (i) No of moles of CO2:
we know,
1 mole = 6.022 × 1023
The number of moles



(ii) Thus, The number of moles = 
Given mass = Number of moles x Molar mass
= 0.5 x 44
= 22g
(c) (i) The number of moles = 
Molar mass of Na = 23g/mole
Given mass = 115g
Thus, the number of moles = 
(ii) 1 mole = 6.022 x 1023
Since, 5 moles = 5 x 6.022 X 1023 = 30.11 X 1023
(d) (i) No of moles of MgCl2 = 0.5
The number of moles = 
Molar mass of MgCl2 = 95g/mole
Thus, mass of MgCl2 = 0.5 X 95 = 47.5g
(ii) Number of particles: 1 mole = 6.022 x 1023
0.5 mole = 0.5 x 6.022 x 1023
Number of particles= 3.011 x 1023
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