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How many moles of OH− are there in 2.467 g of Mg(OH)2?Give your answer in moles and to three decimal places.(Molar mass of  Mg(OH)2 = 58.32 g mol−1)

Question

How many moles of OH− are there in 2.467 g of Mg(OH)2?

Give your answer in moles and to three decimal places.

(Molar mass of Mg(OH)2 = 58.32 g mol−1)

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Solution

The number of moles of a substance can be calculated using the formula:

Number of moles = mass of substance / molar mass of substance

Here are the steps to calculate the number of moles of OH- in Mg(OH)2:

  1. Calculate the number of moles of Mg(OH)2 using the given mass and molar mass. Number of moles = 2.467 g / 58.32 g/mol = 0.042 mol.

  2. Each unit of Mg(OH)2 contains two OH- ions. Therefore, the number of moles of OH- is twice the number of moles of Mg(OH)2.

  3. Calculate the number of moles of OH-: Number of moles of OH- = 2 * 0.042 mol = 0.084 mol.

So, there are 0.084 moles of OH- in 2.467 g of Mg(OH)2.

This problem has been solved

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