Anions have more ___ then _

Rank and explain how the freezing point of 0.100 m solutions of the following ionic electrolytes compare. List from lowest freez

Elden [556K]

Answer:

The solutions are listed from the lowest freezing point to highest freezing point.

Mg₃(PO₄)₂ - AlBr₃ - BeBr₂ - KBr

Explanation:

Colligative property of freezing point, is the freezing point depression.

Formula is:

ΔT = Kf . m . i

Where ΔT = T° freezing pure solvent - T° freezing solution

Kf is the cryoscopic constant

m is molality and i is the Van't Hoff factor (number of ions, dissolved in solution)

In this case, T° freezing pure solvent is 0° because it's water, so the Kf is 1.86 °C/m, and m is 0.1 molal.

The i modifies the T° freezing solution. The four salts, are ionic compounds, so for each case:

BeBr₂ → Be²⁺ + 2Br⁻ i = 3

AlBr₃ → Al³⁺ + 3Br⁻ i = 4

Mg₃(PO₄)₂ → 3Mg²⁺ + 2PO₄⁻³ i = 5

KBr → K⁺ + Br⁻ i = 2

Solution of Mg₃(PO₄)₂ will have the lowest temperature of freezing and the solution of KBr, the highest (always lower, than 0°).

8 0

3 years ago

Diabetes mellitus is characterized by too much glucose buildup in the blood. In _________________ diabetes, this is because the

ELEN [110]

The best answer is b) yess it’s b try it it’s the best one I’m pretty sure

3 0

3 years ago

A syringe contains 56.05 mL of gas at 315.1 K. What volume will that gas occupy if the temperature is increased to 380.5 K?

Marianna [84]

This is one of the ideal gas laws. Presumably the pressure remains the same so it is not part of the givens.

Formula

V / T = V1 / T1

Givens

V = 56.05 mL
T = 315.1 degrees Kelvin
V1 = x
T1 = 380.5 degrees Kelvin

Solution

56.05/315.1 = x/380.5 Simplify the left.

0.1779 = x / 380.5 Multiply both sides by 380.5

0.1779 * 380.5 = 380.5x/380.5

67.68 mL = x This is your answer

5 0

3 years ago

Read 2 more answers

One crystalline form of silica (SiO2) has a cubic unit cell, and from X-ray diffraction data it is known that the cell edge leng

Sav [38]

Answer:

8 Silicon atom are present in unit cell.

16 oxygen atoms are present unit cell.

Explanation:

Number of atoms in unit cell = Z =?

Density of silica = tex]2.32 g/cm^3[/tex]

Edge length of cubic unit cell = a = 0.700 nm = $0.700\times 10^{-7} cm$

$1 nm=10^{-7} cm$

Molar mass of Silica = $28.09 g/mol+16.00\times 2=60.09 g/mol$

Formula used :

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density

Z = number of atom in unit cell

M = atomic mass

$(N_{A})$ = Avogadro's number

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

$2.32 g/cm3=\frac{Z\times 60.09 g/mol}{6.022\times 10^{23} mol^{-1}\times (0.700\times 10^{-7}cm)^{3}}$

$Z = 8$

1 silicon is 2 oxygen atoms. then 8 silicon atoms will be 16 oxygen atoms.

5 0

4 years ago

Select all the properties of a shield volcano listed below.

GREYUIT [131]

<span>A. Basaltic lava her u go

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4 0

3 years ago

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Anions have more ___ then __

Anions have more _ then