Electrostatic Force between the sodium ion and the chloride ion.

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SUMMARY

The electrostatic force between a sodium ion (Na+) and a chloride ion (Cl-) in solid sodium chloride (NaCl) is calculated using Coulomb's law. The formula applied is F = k|q1*q2|/r2, where k is Coulomb's constant (8.99e9 N m2/C2), q1 and q2 are the charges of the ions (1.602e-19 C), and r is the distance between the ions (0.28 nm or 2.8e-10 m). The calculated force is 2.94e-9 N. The user encountered an issue submitting this value on Connect, indicating a potential misunderstanding of the problem or the required precision.

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In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the chloride ion.

What I did was the following:
F=k|q1*q2|/r^2

F=8.99e9(1.602e-19*1.602e-19)/(2.8e-10)^2
F= 2.94e-9 N

I try to submit it on Connect but it says is wrong. I tried with 2.94e-9 N and 2.9e-9 N. Can someone please tell me what I'm doing wrong.
 
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