Answer
7.826x$10^{13}$ molecules
Work Step by Step
To get this answer, see that 1.3x$10^{-10}$M=1.3x$10^{-10}$mol/L.
1.3x$10^{-10}$Mx1L=1.3x$10^{-10}$mol present.
1.3x$10^{-10}$molx6.02x$10^{23}$molecules/mol=7.826x$10^{13}$molecules
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