The answer is going to be d
Answer:
Total moles of ions are released in water are 
.
Explanation:
Mass of calcium nitrate = 
Molar mass of calcium nitrate = 164 g/mol
Moles of calcium nitrate = 
According to reaction, 1 mole of calcium nitrate gives 1 mole of calcium ions, then 
moles of calcium nitrate will give:
of calcium ions
According to reaction, 1 mole of calcium nitrate gives 2 mole of nitrate ions, then moles of calcium nitrate will give:
of nitrate ions
Total moles of ions are released :
Answer:
1683.6J
Explanation:
Given:
n= no. Of mol= 2.70 mol
T= Temperature= 30.0 K
Q= n Cv × ∆T .........eqn(1)
Where CV= molar heat capacity=5/2R for diatomic particle ,such as H2
CV= molar heat capacity=3/2R for diatomic, such as H
R= gas constant= 8.314 J/mol.K
Q= heat energy
For a diatomic molecules
Q= n Cv × T
But
Cv= molar heat capacity=5/2R = 5/2(8.314)=20.785
CV= 20.785
. ∆T= Temperature= 30.0 K
Then substitute the values into the eqn(1)
Q= 2.70 × 5/2(8.314) × 30
Q= 2.70 × 20.785 × 30
=1683.6J
Answer:
It is present in third period that's why its valance electrons are present in 3rd energy level.
Its atomic number is greater than lithium when compared in group wise.
There are more electrons in sodium to shield the outer valance electron thus nuclear attraction becomes weak and size increase.
Explanation:
The size of sodium is greater than lithium because atomic number of sodium is 11 and lithium is 3. Both are present in first group but sodium is present down to the lithium. As we move from top to bottom in a group atomic size increases with addition of electrons. The nuclear effect become weaker on valance electrons and atomic size increase. Same time shielding effect is also produces which shield the outer electrons from the influence of nucleus. While in case of lithium less electrons are present to shield the valance electrons.
As we note the position of both elements along period. The sodium is present in third period while lithium is present in second period. So, in case of sodium third energy level is involved. That's why its size is greater than lithium.
Answer:
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