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28.07.2022 - 14:17

What mass (in grams) of cobalt(II) nitrate hexahydrate is needed to make 100.0 mL of 0.10 M cobalt(II) nitrate solution?

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What mass (in grams) of cobalt(II) nitrate hexahydrate is needed to make 100.0 mL of 0.10 M cobalt(II) nitrate solution?

Answers (1)

Camryn April 2, 2023 в 07:49

The first step to solving this problem is to use the equation: Molarity = moles of solute / liters of solution We know the molarity of the solution (0.10 M) and the volume of the solution (100.0 mL, or 0.100 L). We need to find the moles of cobalt(II) nitrate needed to make this solution. Moles of solute = Molarity x liters of solution Moles of solute = 0.10 M x 0.100 L Moles of solute = 0.010 moles of cobalt(II) nitrate Now we can use the molar mass of cobalt(II) nitrate hexahydrate (237.93 g/mol) to find the mass needed to make 0.010 moles of cobalt(II) nitrate: Mass = moles x molar mass Mass = 0.010 moles x 237.93 g/mol Mass = 2.38 grams of cobalt(II) nitrate hexahydrate Therefore, to make 100.0 mL of 0.10 M cobalt(II) nitrate solution, we need 2.38 grams of cobalt(II) nitrate hexahydrate.

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