Question

if you weighed out 25.0 g of nacl, how many moles of nacl would you have? (mm nacl = 58.44 g/mol)
1460 g
0.428 g
1.14 g
83.44 g
question 3
4 pts
a volumetric flask contains 250.00 ml solution. what is the volume of this solution in units of liters?
2.5×10⁵ l
2.5000 × 10⁵ l
0.25000l
0.25 l

Explanation:

Step1: Convert grams to moles

Use the formula \(n=\frac{m}{M}\), where \(n\) is the number of moles, \(m\) is the mass (\(m = 25.0\space g\)), and \(M\) is the molar mass (\(M=58.44\space g/mol\)).
\(n=\frac{25.0\space g}{58.44\space g/mol}\)

Step2: Calculate the value

\(n=\frac{25.0}{58.44}\approx0.428\space mol\)

Step3: Convert milliliters to liters

Use the conversion factor \(1\space L = 1000\space mL\). So, \(V (in\space L)=\frac{V (in\space mL)}{1000}\)
For \(V = 250.00\space mL\), \(V=\frac{250.00}{1000}=0.25000\space L\)

Answer:

For the first question: \(0.428\space mol\) (but the options have unit errors as the question asks for moles but options have grams. Assuming it's a typo and based on calculation \(n\approx0.428\)).
For the second question: \(0.25000\space L\)