Name four elements that have properties similar to chlorine

Water has a boiling point of 100.0°C and a Kb of 0.512°C/m. What is the boiling

Reil [10]

Answer:

The boiling point of a 8.5 m solution of Mg3(PO4)2 in water is 394.91 K.

Explanation:

The formula for molal boiling Point elevation is :

$\Delta T_{b} = iK_{b}m$

$\Delta T_{b}$ = elevation in boiling Point

$K_{b}$ = Boiling point constant( ebullioscopic constant)

m = molality of the solution

i = Van't Hoff Factor

Van't Hoff Factor = It takes into accounts,The abnormal values of Temperature change due to association and dissociation .

In solution Mg3(PO4)2 dissociates as follow :

$Mg_{3}(PO_{4})_{2}\rightarrow 3Mg^{2+} + 2 PO_{4}^{3-}$

Total ions after dissociation in solution :

= 3 ions of Mg + 2 ions of phosphate

Total ions = 5

i = Van't Hoff Factor = 5

m = 8.5 m

$K_{b}$ = 0.512 °C/m

Insert the values and calculate temperature change:

$\Delta T_{b} = iK_{b}m$

$\Delta T_{b} = 5\times 0.512\times 8.5$

$\Delta T_{b} = 21.76 K$

Boiling point of pure water = 100°C = 273.15 +100 = 373.15 K

$\Delta T_{b} = T_{b} - T_{b}_{pure}$

$T_{b}_{pure}$ = 373.15 K[/tex]

21.76 = T - 373.15

T = 373.15 + 21.76

T =394.91 K

8 0

3 years ago

How many electrons will each element gain or lose in forming an ion?

Amanda [17]

It depends on the number of valence electrons required to make octet or duplet( in case of H). For example, Nitrogen(atomic number = 7) has electronic configuration(2,5) which means nitrogen has 5 valence electrons and requires 3 more electrons to complete its octet. After gaining 3 electrons from atoms of an element with less electronegativity than N, it forms nitride ion ( $N ^{-3}$ ). Hope this helps.

8 0

3 years ago

Explain why ethics and skepticism are integral to science.

sdas [7]

Ethics and Skepticism are integral to science because they are the basis for the need to lay explanations on various fields of science through experiment. This will enable science bring the right data and arguments through scientific methods in an accurate and a straight forward manner.

Hope this helped have an awesome day :)

8 0

3 years ago

Help me please i need this aaaaaaaaa <3

mylen [45]

Can someone help me out too? , on my question?

4 0

2 years ago

Read 2 more answers

Calculate ΔHrxn for the following reaction: Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) Use the following reactions and given ΔH′s. 2Fe(s)+3/

sesenic [268]

Answer:

The answer to your question is: ΔHrxm = -23.9 kJ

Explanation:

Data:

2Fe(s)+3/2O2(g)→Fe2O3(s), ΔH = -824.2 kJ (1)

CO(g)+1/2O2(g)→CO2(g) ΔH = -282.7 kJ (2)

Reaction:

Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)

We invert (1) and change the sign of ΔH

Fe2O3(s) → 2Fe(s)+3/2O2(g) ΔH = 824.2 kJ

We multiply (2) by 3

3( CO(g)+1/2O2(g)→CO2(g) ΔH = -282.7 kJ) (2)

3CO(g)+3/2O2(g)→3CO2(g) ΔH = -848.1 kJ

We add (1) and (2)

Fe2O3(s) → 2Fe(s)+3/2O2(g) ΔH = 824.2 kJ

3CO(g)+3/2O2(g)→3CO2(g) ΔH = -848.1 kJ

Fe2O3(s) + 3CO(g)+3/2O2(g) → 2Fe(s)+3/2O2 + 3CO2(g)

Simplify

Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) and ΔHrxm = -23.9 kJ

6 0

2 years ago