chemistry 20 stoichiometry quiz\nname: ebtesam\nmultiple choice\n3. what is the molar mass of aluminum…

chemistry 20 stoichiometry quiz\nname: ebtesam\nmultiple choice\n3. what is the molar mass of aluminum sulfate?\n□ 342.17 g/mol\n□ 342.17 g\n□ 123.05 g\n□ 123.05 g/mol

chemistry 20 stoichiometry quiz\nname: ebtesam\nmultiple choice\n3. what is the molar mass of aluminum sulfate?\n□ 342.17 g/mol\n□ 342.17 g\n□ 123.05 g\n□ 123.05 g/mol

Answer

Explanation:

Step1: Determine the formula of aluminum sulfate

The formula is $Al_2(SO_4)_3$.

Step2: Find the molar mass of each element

Aluminum (Al): molar - mass of Al is $26.98\ g/mol$, and there are 2 Al atoms. Sulfur (S): molar - mass of S is $32.07\ g/mol$, and there are 3 S atoms. Oxygen (O): molar - mass of O is $16.00\ g/mol$, and there are 12 O atoms.

Step3: Calculate the molar mass of aluminum sulfate

[ \begin{align*} M&=2\times26.98\ g/mol+3\times32.07\ g/mol + 12\times16.00\ g/mol\ &=53.96\ g/mol+96.21\ g/mol+192.00\ g/mol\ &=342.17\ g/mol \end{align*} ]

Answer:

342.17 g/mol