You are asked to prepare 100ml of a 1.5m kbr solution. what mass of kbr do you need? show your calculation in the space provided

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you are asked to prepare 100ml of a 1.5m kbr solution. what mass of kbr do you need? show your calculation in the space provided.

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you are asked to prepare 100ml of a 1.5m kbr solution. what mass of kbr do you need? show your calculation in the space provided.

Answer: To prepare a 100 mL of a 1.5 M (molar) KBr (potassium bromide) solution, you’ll need to calculate the mass of KBr required using its molarity and the volume of the solution you want to make.

Here’s the calculation:

  1. Calculate the number of moles of KBr required using the formula:

    Moles = Molarity (M) x Volume (L)

    Moles = 1.5 mol/L x 0.100 L = 0.15 moles

  2. Calculate the molar mass of KBr. Potassium (K) has an atomic mass of approximately 39.10 g/mol, and bromine (Br) has an atomic mass of approximately 79.90 g/mol. So, the molar mass of KBr is:

    Molar mass of KBr = 39.10 g/mol (K) + 79.90 g/mol (Br) = 119.00 g/mol

  3. Calculate the mass of KBr required:

    Mass (g) = Moles x Molar mass

    Mass (g) = 0.15 moles x 119.00 g/mol ≈ 17.85 grams

So, you will need approximately 17.85 grams of KBr to prepare 100 mL of a 1.5 M KBr solution.