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19 April, 09:31

In the laboratory you are asked to make a 0.114 m ammonium sulfide solution using 255 grams of water. How many grams of ammonium sulfide should you add? grams.

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  1. 19 April, 12:17
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    The mass of (NH₄) ₂S we may add to the solution is: 1.98 g

    Explanation:

    We interpret the given dа ta:

    0.114 m → moles of solute in 1kg of solvent

    255 g → the mass of solvent

    As we have 0.114 moles of solute ((NH₄) ₂S) in 1kg, we must determine the moles in our mass of solvent (255 g H₂O)

    We convert the mass of solvent to kg → 255 g. 1 kg/1000g = 0.255 kg

    Now we can determine the moles of solute, we used:

    0.114 mol/kg. 0.255 kg = 0.02907 moles

    If we convert the moles to mass → 0.02907 mol. 68.1g / 1mol = 1.98 g
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