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)
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:
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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.
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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.
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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.
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