Answer to Question #148803 in General Chemistry for Bria Parker

Question

Be sure to answer all parts.

How many total moles of ions are released when the following sample dissolves completely in water? Enter your answer in scientific notation.

7.72 × 10^-4 g of Ca(NO3)2: ___ × 10^_____mol

Answer 1

Ca(NO₃)₂ $\rightarrow$ Ca²⁺ + 2NO₃^-

moles of Ca(NO₃)₂ = $\frac{7.72× 10^{-4}}{164.08}$

moles of Ca(NO₃)₂ = 4.7× 10^-6 moles

Total number of ions = 3

so according to stoichiometry total concentration of ions = 3 × 4.7× 10^-6 moles

which is equal to 14.1× 10^-6 moles