Answer:
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
Consider the example of sodium and potassium.
Sodium is present above the potassium with in same group i.e, group one.
The atomic number of sodium is 11 and potassium 19.
So potassium will have larger atomic radius as compared to sodium.
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
Answer: The stoichiometric coefficient for oxygen is .
Explanation:
A number present on the front of an atom, ion or molecule in a chemical reaction equation is called a stoichiometric coefficient.
For example,
Here, the stoichiometric coefficient for is 1, for is 1 and for is .
Thus, we can conclude that the stoichiometric coefficient for oxygen is .
Answer:
1 and 2
Trigonal planar
Tetrahedral
Trigonal Planar
Linear
Bent ( v- shape)
Explanation:
The highlighted atoms has a delocalized lone pair - 1 and 2
All sp2-hybridized carbon atoms have geometry- Trigonal planar
All sp3-hybridized carbon atoms have geometry - Tetrahedral
The nitrogen atom has geometry - Trigonal Planar
The oxygen atom of the C=O bond has geometry - Linear
and the other oxygen atom has geometry - Bent ( v- shape)
P.S - The correct question is -
Answer:
Explanation:
Hello,
In this case, it is more convenient to define this titration in terms of normality:
In such a way, the normality of the acid, considering the normality of sodium hydroxide equals its molarity (one hydroxile in its structure) is:
Thus, the moles are:
Hence, the molar mass:
Best regards.
2 moles of H₂ : 1 mole of O₂ : 2 moles of H₂O
number of moles of H₂ : number of moles of H₂O = 1 : 1
There are 5 moles of hydrogen so there must be 5 moles of water too.
The mass of H₂O is 90 g.