Chemistry, 14.09.2019 08:30 XxalyxX3487

Arrange the following aqueous solutions in order of increasing boiling points 0.050 m mg(no3): 0.100 m ethanol 0.090 m nacl ethanol

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Answer from: santosbeti90

The order of increasing boiling points follows:

$\text{Ethanol }$

Explanation:

The expression of elevation in boiling point is given as:

$\Delta T_b=i\times k_b\times m$

where,

$\Delta T_b$ = Elevation in boiling point

i = Van't Hoff factor

T_b = change in boiling point

k_b = boiling point constant

m = molality

For the given options:

Option 1: 0.050 m Mg(NO_3)_2

Value of i = 3

So, molal concentration will be = $(0.05)\times 3=0.15m$

Option 2: 0.100 m ethanol

Value of i = 1 (for non-electrolytes)

So, molal concentration will be = $(0.100)\times 1=0.100m$

Option 3: 0.090 m NaCl

Value of i = 2

So, molal concentration will be = $(0.09)\times 2=0.18m$

As, the molal concentration of NaCl is the highest, so its boiling point will be the highest.

Thus, the order of increasing boiling points follows:

$\text{Ethanol }$

Answer from: Quest

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

Which of the following best illustrates the role that gravity played in the formation of the solar s

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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Arrange the following aqueous solutions in order of increasing boiling points 0.050 m mg(no3): 0.10...

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