Question

How many moles of $A{l}_2{(S{O}_4)}_3$ would be in 50 g of the substance?

• A. 0.083 mol
• B. 0.952 mol
• C. 0.481 mol
• D. 0.140 mol

Answer 1

Answer: (D)

Key Idea: $Moles=\frac{mass}{molecularweight}$ Given, mass of $A{l}_2{(S{O}_4)}_3=50g$ molecular mass of $A{l}_2{(S{O}_4)}_3=342g$ $\therefore$ Moles of $A{l}_2{(S{O}_4)}_3=\frac{50}{342}=0.14mol$