Answer :
Answer:
2.897×10⁻⁹ N.
Explanation:
From coulomb's law,
F = kqq'/r² ........................ Equation 1
Where F = attractive force between the ions, q = charge on sodium ion, q' = charge on chlorine ion, r = distance between sodium and chlorine ion, k = coulomb's constant
Given:q = 11×1.6×10⁻¹⁹ C, q' =17×1.6×10⁻¹⁹ C, r = 2.82×10⁻¹⁰ m, k = 9×10⁹ Nm²/C²
Substitute into equation 1
F = 9×10⁹ (1.6×10⁻¹⁹ )(1.6×10⁻¹⁹ )/(2.82×10⁻¹⁰ )²
F = 23.04×10⁹ (2.56×10⁻³⁸)/(7.9524×10⁻²⁰)
F =(23.04×10⁻²⁹)/(7.9524×10⁻²⁰)
F = 2.897×10⁻⁹ N.