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2 years ago

How many grams are KBr are needed to make a saturated solution in 100g of water at 30c

Chemistry

1 answer:

erastova [34]2 years ago

5 0

Explanation:

To calculate that you need to know the value of the Kps (constant of solubility) at 30°C of KBr in water.

<u>When the product of the concentrations of both ions (Br- and K+) equals the Kps, the solution is saturated. </u>

Given the disociation of the salt in water:

$KBr \longrightarrow K^+ + Br^-$

The concentration of both ions are equal (1:1 ratio) and the same as the concentration of KBr added.

The Kps:

$Kps=[K^+][Br^-]$

$[KBr]=(Kps)^{1/2}$

[KBr] are <u>moles of the salt per litre of water</u>

Assuming a density of water of 1 g/cm3, 100 g are 0.1 litre

To calculate the mass:

$m=[KBr]*M*0.1 litre$

where M is the molecular weight of the salt.

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Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The o

liberstina [14]

Answer: Molar concentration of the tree sap have to be 0.783 M

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iCRT$

where,

$\pi$ = osmotic pressure of the solution = 19.6 atm

i = Van't hoff factor = 1 (for non-electrolytes)

R = Gas constant = $0.0821\text{ L.atm }mol^{-1}K^{-1}$

T = temperature of the solution = $32^oC=[273+32]=305K$

Putting values in above equation, we get:

$19.6atm=1\times C\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 305K$

$C=0.783M$

Thus the molar concentration of the tree sap have to be 0.783 M to achieve this pressure on a day when the temperature is 32°C

4 0

3 years ago

Chemistry Conversion

kvv77 [185]

Answer:

Explanation:

193.02 times 9.55 it's going to be 1843.341

9.55= 191.20 milli

4 0

3 years ago

How many moles of tungsten carbide will be produced if plenty of tungsten is reacted with 1.25 moles of carbon?

Tanya [424]

Answer:

1.25 moles of tungsten carbide

Explanation:

Tungsten carbide, WC, is a substance that is produced prom carbon and tungsten as follows:

W + C → WC

Based on the reaction, 1 mole of Carbon produce 1 mole of tungsten carbide. That means if 1.25 moles of carbon are added in excess of tungsten, the moles of tungsten carbide produced are:

<h3>1.25 moles of tungsten carbide</h3>

8 0

3 years ago

Why do you think dark surfaces absorb radiation better than light surfaces?

laiz [17]

Your answer→ <em>The lighter side absorbs less of the incident light, reflecting some of the energy. Darker materials also emit radiation more readily than light-colored materials, so they cool faster.</em>

7 0

2 years ago

If an electron falls from the n = 2 to the n = 1 energy levels in a Hydrogen atom what wavelength of light is emitted?

telo118 [61]

The wavelength is obtained as 122 nm. Option A

<h3>What is the wavelength?</h3>

We know that from the Bohr model of the atom, an electron can move from a higher energy level to a lower energy level or from a lower energy level to a higher energy level. This is the idea of energy quantization as put forward by Neill Bohr.

The wavelength can be obtained by the use of the formula;

1/λ = RH(1/n^2initial - 1/n^2 final)

λ = wavelength of the emitted light

RH = Rydberg's constant

n intial = initial energy level

nfinal = final energy level

Thus;

1/λ = 1.09 * 10^7(1/1^2 - 1/2^2)

1/λ = 1.09 * 10^7( 1 - 0.25)

λ = 122 nm

Learn more about the wavelength:brainly.com/question/13533093

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6 0

1 year ago