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3 years ago

What is the molality of a solution that contains 5 moles of solute in 100 kilograms of water?

Chemistry

2 answers:

vladimir2022 [97]3 years ago

5 0

Answer:

$m=0.05m$

Explanation:

Hello,

In this case, molality is defined as:

$m=\frac{n_{solute}}{m_{solvent}}$

Whereas the mass of the solvent is given in kilograms. In such a way, for 5 moles of solute and 100 kg of water, the molality turns out:

$m=\frac{5mol}{100kg}\\ m=0.05\frac{mol}{kg}$

Now it is important to notice that the molal units (m) equals mol/kg, thereby:

$m=0.05m$

Best regards.

slega [8]3 years ago

3 0

Answer:
molality = (moles of solute) / (kilogram of solvent)

moles of solute = (75.2 g AgClO4) / (mole mass AgClO4)
moles of solute = (75.2 g AgClO4) / (207.3206 g/mol)
moles of solute = 0.3627232 mol

molality = (0.3627232 mol) / (0.0752 Kg)
molality = 4.8234468 m or 4.82 m rounded to three significant figures

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love history [14]

Answer:

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Explanation:

Ionic radius is the radius of an atom´s ion in ionic crystal structure. In an ion that lose an electron, to form a cation, the radius of the ion gets smaller, because the repulsion between electrons decrease because fewer electrons are present. Conversely, adding on electron to a neutral atom, to form an anion, causes electron - electron repulsions to increase, so the size of the radius of the ion gets bigger.

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We will use this principle to solve our problem.

In our case, the given ions are:

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O⁻²: Z= 8, e⁻ =10
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where Z= number of protons, and e⁻ = number of electrons.

Hence the decreasing order of ionic radius is:

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Have a nice day!

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