Answer:
.00000005 C or 50 x 10^-9 C
Explanation:
Like charges REPEL
k = 8.99 x 10^9 kg m^3 / s^2 C^2 ( they should have given units of this)
F = k q1q2/r^2 q1 = q2 so
F = k q^2 / r^2
9 x 10^-3 = 8.99 x 10^9 * q^2 /.05^2 (.05 m = 5cm)
q = .00000005 C
Answer: 0.4578 g
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
where,
n= moles of solute
= volume of solution in ml = 25.0 ml
Thus 0.4578 g of nickel(II) nitrate is to be dissolved in 25.0 mL of 0.100 M solution.
The acid dissociation constant(Ka) is 0.0095
The reaction for this dissociation of acid is
HSO4 ⇄H+ + SO4 -2
The dissociation constant can be determined from the following expression
[H+] = 10-PH
= 10-1.35
[H+] = 0.0447
[H+] = 0.0447 mol / L
From equation, [H+] = [SO4-2] = 0.0447 mol / L
[SO4-2] = 0.0447 mol / L
From the values of [H+], [SO4-2] and [HSO4] Ka can be calculated as follows,
Ka = 0.0447 * 0.0447 / 0.200
= 0.0019 / 0.200
= 0.0095
Hence the value of the acid dissociation constant (Ka) for the given reaction is 0.0095
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I think the awnser to your question is C
Answer:
Explanation:
The core makes the Magnetic field around the Earth:)