Answer:

Explanation:
The work function of the sodium= 495.0 kJ/mol
It means that
1 mole of electrons can be removed by applying of 495.0 kJ of energy.
Also,
1 mole =
So,
electrons can be removed by applying of 495.0 kJ of energy.
1 electron can be removed by applying of
of energy.
Energy required =
Also,
1 kJ = 1000 J
So,
Energy required =
Also,
Where,
h is Plank's constant having value
c is the speed of light having value
So,
Also,
1 m = 10⁻⁹ nm
So,

Answer:
I don't understand your questions
Answer:
26.4960 is the answer for the first one
8.9569 is the answer for the second one
Answer:
The blood will contain 750 grams of O2
Explanation:
Volume of blood in the human body = 15 deciliters
Mass of hemoglobin per deciliter of blood = 15 grams
Mass of hemoglobin in 50 deciliters of blood = 50×15 = 750 grams
Since all the hemoglobin molecules are saturated with O2, mass of O2 in the blood will be the same as mass of hemoglobin molecules in the blood.
Therefore, mass of O2 in the blood is 750 grams
Exothermic reaction is when the system releases energy to the surrounding, the energy (in the perspective of the system) will have a sign of negative, as the system is transferring energy towards the surrounding.
Endothermic reaction is when the system is absorbing energy from the surrounding, the energy (in the perspective of the system) will have a sign of positive, as energy is transferred to the system.