When you add salt to water, you lower to freezing point of the substance.
So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered.
In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.
They can be separated by both means as they are only mixtures. (Two or more substances mixed together, and can be separated.)
There are 5.4 × 10^23 atoms in 12 g NaOH
.
<em>Step 1</em>. Convert <em>grams of NaOH to moles of NaOH
</em>
Moles of NaOH = 12 g NaOH × (1 mol NaOH /40.00 g NaOH)
= 0.300 mol NaOH
<em>Step 2</em>. Convert <em>moles of NaOH to formula units (FU) of NaOH
</em>
FU of NaOH = 0.300 mol NaOH × (6.022 × 10^23 Fu NaOH/1 mol NaOH)
= 1.81 × 10^23 FU NaOH
<em>Step 3</em>. Convert <em>FU of NaOH to atoms
</em>
1.81 × 10^23 FU NaOH × (3 atoms/1 FU NaOH) = 5.4 × 10^23 atoms
