How many moles of Ag+ ions are present in 10 ml of a 0.75 M AgNO3 solution? a. 9.1 x 10^-3
b. 7.5 x 10^-3
c. 2.0 x 10^-2
d. 2.75 x 10^-2
e. 1.75 x 10^-2

b. 7.5 x 10^-3

Explanation:

To solve this problem we need to keep in mind the definition of molarity:

With the above information in mind it is possible to calculate the moles of solute, given the volume (10 mL) and concentration (0.75 M) of the solution:

Then we calculate the moles of AgNO₃:

One mole of AgNO₃ contains one mole of Ag⁺, thus the number of Ag⁺ moles is also 7.5x10⁻³.