(b) a singly ionized sodium atom, Na+ charge 1.60e-19 C mass 3.84e-26 kg (c) a c
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Question
(b) a singly ionized sodium atom, Na+ charge 1.60e-19 C mass 3.84e-26 kg (c) a chloride ion CI^- charge -1.60e-19 C mass 5.93e-26 kg (d) a doubly ionized calcium atom, Ca^++ = Ca^2+ charge 3.20e-19 C mass 6.68e-26 kg (e) the center of an ammonia molecule, modeled as an N^3- ion charge -4.8e19 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. C mass 2.34e-26 kg (f) quadruply ionized nitrogen atoms, N^4+, found in plasma in a hot star charge 6.40e-19 C mass 2.34e-26 kg (g) the nucleus of a nitrogen atom charge 11.2e-19 C mass 2.34e-26 kg (h) the molecular ion H_2O^- charge -1.60e-19 C mass 3.01e-26 kgExplanation / Answer
b) Charge on Na+ =1.6 X 10-19 c
Mass Calculation
Molar mass of Na = 22.98977 g/mole
Avogadro number = 6.022045X10^23
Mass per atom = 22.98977 g/mol /( 6.022045X10^23) = 3.817602 X 10^-23 g/atom X 1 kg/1000 g = 3.817602 X 10-26 kg
Mass of an electron = 9.109 X 10-31 kg
So, mass of Na+1 sodium ion = 3.817602 X 10-26 - 9.109 X 10-31 = 3.8175 X 10-26 kg
c) Charge on Cl-1 ion =- 1.6 X 10-19 C
Mass calculation
Molar mass of Cl = 35.45 g/mole
Avogadro number = 6.022045X10^23
Mass per atom = 35.45 g/mol / (6.022045X10^23) = 5.8867 X 10^-23 g/atom X 1 kg/1000 g = 5.8867 X 10-26 kg
Mass of an electron = 9.109 X 10-31 kg
So, mass of Cl-1 ion = 5.8867 X 10-26 + 9.109 X 10-31 = 5.8868 X 10-26 kg
d) Charge on Ca++ =3.2 X 10-19 c
Mass calculation
Molar mass of Ca = 40.078 g/mol
Avogadro number = 6.022045X10^23
Mass per atom = 40.078 g/mol /( 6.022045X10^23) = 6.655 X 10^-23 g/atom X 1 kg/1000 g = 6.655 X 10-26 kg
Mass of an electron = 9.109 X 10-31 kg
So, mass of Ca++ sodium ion = 6.655 X 10-26 – 2*9.109 X 10-31 = 6.6551 X 10-26 kg
e) Charge on N3- ion =- 4.8 X 10-19 C
Mass calculation
Molar mass of N= 42.021 g/mole
Avogadro number = 6.022045X10^23
Mass per atom = 42.021 g/mol / (6.022045X10^23) = 6.9778 X 10^-23 g/atom X 1 kg/1000 g = 6.9778 X 10-26 kg
Mass of an electron = 9.109 X 10-31 kg
So, mass of N3- ion = 6.9778 X 10-26 +3* 9.109 X 10-31 = 6.9782 X 10-26 kg
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