Question

1 fill in the blank 1 point
al₂o₃
for the formula above, there are:
atom(s) of al
type your answer...
atom(s) of o
type your answer...
the molar mass of the substance is type your answer... grams/mole. (round answer to 2 decimal places) make sure to the periodic table in your journal.

Explanation:

Step1: Count the number of Al atoms

In the formula \(Al_2O_3\), the subscript of \(Al\) is \(2\). So, the number of \(Al\) atoms is \(2\).

Step2: Count the number of O atoms

In the formula \(Al_2O_3\), the subscript of \(O\) is \(3\). So, the number of \(O\) atoms is \(3\).

Step3: Calculate the molar mass

The atomic mass of \(Al\) is \(26.98\space g/mol\) and the atomic mass of \(O\) is \(16.00\space g/mol\).
The molar mass of \(Al_2O_3\) is \(2\times26.98 + 3\times16.00\)

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Answer:

• atom(s) of \(Al\): \(2\)
• atom(s) of \(O\): \(3\)
• molar mass: \(101.96\)