Answered

Discover a wealth of knowledge at Westonci.ca, where experts provide answers to your most pressing questions. Get detailed and accurate answers to your questions from a community of experts on our comprehensive Q&A platform. Our platform offers a seamless experience for finding reliable answers from a network of knowledgeable professionals.

### Questions for Freezing Point Depression

#### Table 6.1
\begin{tabular}{|c|c|c|c|c|c|}
\hline Solution & \begin{tabular}{c}
Lowest \\
Temperature [tex]${ }^{\circ} C$[/tex]
\end{tabular} & \begin{tabular}{c}
[tex]$1^{\text {st }}$[/tex] Trial [tex]${ }^{\circ} C$[/tex] \\
Freezing Point
\end{tabular} & \begin{tabular}{c}
[tex]$2^{\text {nd }}$[/tex] Trial [tex]${ }^{\circ} C$[/tex] \\
Freezing Point
\end{tabular} & \begin{tabular}{c}
Average [tex]${ }^{\circ} C$[/tex] \\
Freezing Point
\end{tabular} & [tex]$\Delta T { }^{\circ} C$[/tex] \\
\hline Sucrose & -7.9 & -1.6 & -1.6 & & \\
\hline [tex]$H_2O$[/tex] & -8.0 & +0.0 & +0.0 & & \\
\hline
\end{tabular}

1. Was there supercooling? Would you expect the water or the sugar solution to have the most supercooling (see the Introduction)? Why?

2. The mass of one mole of sugar is [tex]$342 g$[/tex]. You used [tex]$19 g$[/tex] of sugar. Calculate the number of moles of sugar you used.

Sagot :

GinnyAnswer
2. The mass of one mole of sugar is [tex]\(342 \text{ g}\)[/tex]. You used [tex]\(19 \text{ g}\)[/tex] of sugar. Calculate the number of moles of sugar you used.

To determine the number of moles of sugar used, we need to use the formula for calculating moles:

[tex]\[ \text{Number of moles} = \frac{\text{Mass of the substance used}}{\text{Molar mass of the substance}} \][/tex]

Given the data:
- The molar mass of sugar (sucrose) is [tex]\(342 \text{ g/mol}\)[/tex].
- The mass of sugar used is [tex]\(19 \text{ g}\)[/tex].

We can substitute these values into the formula:

[tex]\[ \text{Number of moles} = \frac{19 \text{ g}}{342 \text{ g/mol}} \][/tex]

Perform the division:

[tex]\[ \text{Number of moles} \approx 0.05555555555555555 \][/tex]

Therefore, the number of moles of sugar used is approximately [tex]\(0.056 \text{ moles}\)[/tex] (rounded to three significant figures).
We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. We appreciate your time. Please revisit us for more reliable answers to any questions you may have. Thank you for choosing Westonci.ca as your information source. We look forward to your next visit.