객관식
What mass of NaCl (in grams) is present in 0.75 L of a 0.115 M NaCl solution?
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Molarity
객관식
How many grams of KCl are required to prepare 50.0 mL of a 2.45 M KCl solution?
A
9.13 g
B
12.25 g
C
6.12 g
D
4.58 g
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검증된 단계별 안내1
Identify the given information: volume of solution (V) = 50.0 mL, molarity (M) = 2.45 M, and the solute is KCl.
Convert the volume from milliliters to liters because molarity is expressed in moles per liter: \(V (L) = \frac{50.0\ \text{mL}}{1000}\).
Use the molarity definition to find the moles of KCl needed: \(\text{moles of KCl} = M \times V (L) = 2.45 \times V (L)\).
Calculate the molar mass of KCl by adding the atomic masses of potassium (K) and chlorine (Cl): \(\text{molar mass of KCl} = 39.10 + 35.45\) g/mol.
Find the mass of KCl required by multiplying the moles by the molar mass: \(\text{mass} = \text{moles} \times \text{molar mass}\).
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