How many millimoles (mmol) of HBr are present in 17.6 mL of a 0.0200 M HBr solution?

• A. 0.352 mmol
• B. 3.52 mmol
• C. 0.0880 mmol
• D. 1.76 mmol

Answer: (A)

Verified step by step guidance

1. Identify the given information: volume of the HBr solution is 17.6 mL and the molarity (M) of the solution is 0.0200 M. Remember that molarity is defined as moles of solute per liter of solution.
2. Convert the volume from milliliters to liters because molarity uses liters as the volume unit. Use the conversion: \$1 \, \text{L} = 1000 \ \text{mL}\(, so \)V_{\text{L}} = \frac{17.6}{1000}$ liters.
3. Calculate the number of moles of HBr using the formula: \(\text{moles} = M \times V_{\text{L}}\), where \(M\) is the molarity and \(V_{\text{L}}\) is the volume in liters.
4. Convert the moles of HBr to millimoles (mmol) by multiplying by 1000, since \$1 \, \text{mol} = 1000 \, \text{mmol}$.
5. Summarize the calculation: \(\text{mmol HBr} = M \times \left( \frac{V_{\text{mL}}}{1000} \right) \times 1000\), which simplifies to \(\text{mmol HBr} = M \times V_{\text{mL}}\). Use this to find the final amount in millimoles.