Chapter 7.1, Problem 7.8PP

Aluminum sulphate, ${\text{Al}}_{\text{2}}{\left({\text{SO}}_{\text{4}}\right)}_{\text{3}}$ , is used in some antiperspirants.

a. How many moles of O are present in 3.0 moles of ${\text{Al}}_{\text{2}}{\left({\text{SO}}_{\text{4}}\right)}_{\text{3}}$ ?
b. How many moles of aluminum ions $\left({\text{Al}}^{\text{3+}}\right)$ are present in 0.40 mole of ${\text{Al}}_{\text{2}}{\left({\text{SO}}_{\text{4}}\right)}_{\text{3}}$ ?
c. How many moles of sulfate ions $\left({\text{SO}}_{\text{4}}{}^{2-}\right)$ are present in 1.5 moles of ${\text{Al}}_{\text{2}}{\left({\text{SO}}_{\text{4}}\right)}_{\text{3}}$ ?