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Determining Formula Mass: Step-by-Step Approach Using Atomic Masses
Chapter 5, Problem 100P(choose chapter or problem)
Name each compound and calculate its formula mass.
(a) \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)
(b) \(\mathrm{P}_{2} \mathrm{O}_{3}\)
(c) HClO(aq)
(d) \(\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{3}\)
Questions & Answers
QUESTION:
Name each compound and calculate its formula mass.
(a) \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)
(b) \(\mathrm{P}_{2} \mathrm{O}_{3}\)
(c) HClO(aq)
(d) \(\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{3}\)
ANSWER:Step 1 of 2
Here, we are going to write the name and calculate the formula mass.
Formula mass is the average mass of the molecule of a compound.
Formula mass of a molecule can be calculated by using the following formula.
Formula mass = (no of atoms of the element ) x (atomic mass of 1st element) + (no of atoms of the element ) x (atomic mass of 2nd element) +...
(a) \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)
The chemical name of the compound is Aluminium sulfate.
Formula mass
\(\begin{array}{l} =2 \times(\text { atomic mass of Al) }+3 \times(\text { atomic mass of S })+12 \text { (atomic mass of O) } \\ =1 \times 26.98 \mathrm{amu}+3 \times 32.065 \mathrm{amu}+12 \times 16.00 \mathrm{amu} \\ =53.96 \mathrm{amu}+96.195 \mathrm{amu}+192 \mathrm{amu} \\ =342.155 \mathrm{amu} \end{array}\)
The formula mass of \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) is 342.155 amu.
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Determining Formula Mass: Step-by-Step Approach Using Atomic Masses
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Discover the method to determine the formula mass for various compounds. Learn about the importance of atomic masses and their role in compounds like Aluminium sulfate, Diphosphorus Trioxide, and more. Understand the step-by-step approach to accurately calculate molecular weights.