Question

calculate the molar mass for al(oh)3 with four significant figures.

1. 44.00 g/mol
2. 75.00 g/mol
3. 78.00 g/mol

Explanation:

Step1: Determine the atomic masses

The atomic mass of \(Al\) is \(27.00\space g/mol\), \(O\) is \(16.00\space g/mol\), and \(H\) is \(1.00\space g/mol\).

Step2: Calculate the molar mass of \(Al(OH)_3\)

$$\begin{align*} Molar\ mass&=27.00+(16.00 + 1.00)\times3\\ &=27.00+17.00\times3\\ &=27.00 + 51.00\\ &=78.00\space g/mol \end{align*}$$

Answer:

1. \(78.00\space g/mol\)