Question

Please Help! Check the following problem for errors. If you find an error, identify it, tell why it is an error and correct the error solving the problem correctly. Convert 0.45 g zinc hydroxide to moles. (Hint: there are errors)
0.65 g ZnOH 82.41 mol = 3.22 X 10 25 mol
6.02X1023 g

Answer 1

The question says only to convert the Zn(OH)₂ into moles. But the given answer has many errors such as formula, mass and moles.

The corrected answer is as follows.

Moles (mol) = mass (g) / molar mass (g/mol)

Mass of Zn(OH)₂ = 0.45 g
Molar mass of Zn(OH)₂ = 99.424 g/mol
Hence, moles of Zn(OH)₂ = 0.45 g / 99.424 g/mol
                                         = 4.526 x 10⁻³ mol