Multiple Choice
If you have 5 mL of a solution with a molarity of 1.2×10⁻⁵ M and add 0.976 g of bleach with a density of 1.08 g/mL, what is the initial concentration of the hypochlorite ion (OCl⁻) in the reaction?
6. Chemical Quantities & Aqueous Reactions
Molarity
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What volume in (µL) of 0.125 M HBr contains 0.170 moles HBr?
A
7.35x103 μ L
B
7.35x106 μ L
C
1.36x103 μ L
D
1.36x109 μ L
E
1.36x106 μ L
Verified step by step guidance1
Start by understanding the relationship between moles, molarity, and volume. The formula to use is: \( \text{Molarity} = \frac{\text{moles}}{\text{volume in liters}} \).
Rearrange the formula to solve for volume: \( \text{Volume in liters} = \frac{\text{moles}}{\text{Molarity}} \).
Substitute the given values into the formula: \( \text{Volume in liters} = \frac{0.170 \text{ moles}}{0.125 \text{ M}} \).
Calculate the volume in liters using the substituted values. This will give you the volume in liters that contains 0.170 moles of HBr.
Convert the volume from liters to microliters (µL) by using the conversion factor: \( 1 \text{ liter} = 1,000,000 \text{ µL} \). Multiply the volume in liters by 1,000,000 to get the volume in microliters.
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