Answer:
(a) The molality of this solution is 0.0613![\frac{moles}{kg}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Bkg%7D)
(b)The molality of this solution is 2.04![\frac{moles}{kg}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Bkg%7D)
Explanation:
The molality (m) of a solution is defined as the number of moles of solute present per kg of solvent.
The Molality of a solution is determined by the expression:
![Molality=\frac{number of moles of solute}{kilograms of solvent}](https://tex.z-dn.net/?f=Molality%3D%5Cfrac%7Bnumber%20of%20moles%20of%20solute%7D%7Bkilograms%20of%20solvent%7D)
Molality is expressed in units ![\frac{moles}{kg}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Bkg%7D)
(a) You have 14.3 g of sucrose (C₁₂H₂₂O₁₁), the solute. With the molar mass of sucrose being 342
, then 14.3 grams of the compound represents the following number of moles:
0.042 moles
Having 685 g= 0.685 kg (being 1000 g= 1 kg) of water, the solvent, molality can be calculated as:
![molality=\frac{0.042 moles}{0.685 kg}](https://tex.z-dn.net/?f=molality%3D%5Cfrac%7B0.042%20moles%7D%7B0.685%20kg%7D)
Solving:
molality= 0.0613![\frac{moles}{kg}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Bkg%7D)
<u><em>The molality of this solution is 0.0613</em></u>
<u><em></em></u>
(b) In this case you have 7.15 moles of ethylene glycol (C₂H₆O₂), the solute, in 3505 g (equal to 3.505 kg) of water, the solvent, molality can be calculated as:
![molality=\frac{7.15 moles}{3.505 kg}](https://tex.z-dn.net/?f=molality%3D%5Cfrac%7B7.15%20moles%7D%7B3.505%20kg%7D)
Solving:
molality= 2.04![\frac{moles}{kg}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Bkg%7D)
<em><u>The molality of this solution is 2.04</u></em>
<em><u /></em>
Answer:
Extract DNA from the fertilizer to identify its origin.
Explanation:
Barnes find out that fertilizer was used in the explosive material. Barnes should now identify the origin of this type of fertilizer so that its root can be determined. When the origin is unable to be determined then Barnes should keep the traces of the fertilizer and try to identify the manufacturer.
I would say that it is answer choice J. This is because A-E is currently and utterly incorrect and will not be right.
Explanation:
The reaction rate decreases with a decrease in temperature. Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. Differences in the inherent structures of reactants can lead to differences in reaction rates.