Answer: Since the mass (27) is equal to number of protons + number of neutrons, then number of neutrons = 27 - 13 = 14. 3.
i hope this is what you wre looking for :) .
Explanation:
try to arrange using the given molecular formula
According to the reaction equation:
and by using ICE table:
CN- + H2O ↔ HCN + OH-
initial 0.08 0 0
change -X +X +X
Equ (0.08-X) X X
so from the equilibrium equation, we can get Ka expression
when Ka = [HCN] [OH-]/[CN-]
when Ka = Kw/Kb
= (1 x 10^-14) / (4.9 x 10^-10)
= 2 x 10^-5
So, by substitution:
2 x 10^-5 = X^2 / (0.08 - X)
X= 0.0013
∴ [OH] = X = 0.0013
∴ POH = -㏒[OH]
= -㏒0.0013
= 2.886
∴ PH = 14 - POH
= 14 - 2.886 = 11.11
-10x = -4*100
x = 40 ounces (amt of 14% alloy needed in the mixture)
-----
100-x = 60 ounces (amt of 24% alloy needed in the mixture)