Chemistry, 06.08.2019 02:30 Boris1002

If you combine 27.1 g of a solute that has a molar mass of 27.1 g/mol with 100.0 g of a solvent, what is the molality of the resulting solution?

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Answer from: beej543

The molality of the solution is 0.1 m.

Explanation:

To calculate the molality of solution, we use the equation:

$Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}$

Where,

$m_{solute}$ = Given mass of solute = 27.1 g

$M_{solute}$ = Molar mass of solute = 27.1 g/mol

$W_{solvent}$ = Mass of solvent = 100 g

Putting values in above equation, we get:

$\text{Molality of solution}=\frac{27.1\times 1000}{27.1\times 100}\\\\\text{Molality of solution}=0.1m$

Hence, the molality of the solution is 0.1 m.

Answer from: LilFreaky666

the molality of the solution is 10 mol/kg

Explanation:

To find the molality of a solution we apply the following formula

$m=\frac{moles of solute}{kg of solvent}$

data:

100 g of solvente

We have the amount of solvent expressed in grams but to be able to use the data in the formula we must pass it to kilograms

we apply a simple rule of three

$1000 g \longrightarrow 1Kg\\100g \longrightarrow x \\x=\frac{(100)(1)}{1000}\\ x=0.1 Kg$

27.1g of solute, molar mass 27.1 g/mol

We need the moles of solute and they give us grams of solute and molar mass

The molar mass is 27.1 g / mol This means that there is 27.1 g for each mol of solute.

The amount of solute we have is 27.1g and according to the molar mass this amount of solute corresponds exactly to 1 mole

Therefore having 27.1 g of solute is equivalent to saying that we have 1 mol of solute

Now that we have the data in the correct units we apply the formula

$m=\frac{moles of solute}{kg of solvent}\\m=\frac{1mol}{0.1kg}\\ m=10 \frac{mol}{kg}$

the molality of the solution is 10 mol/kg

Answer from: Quest

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

Answer from: Quest

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

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If you combine 27.1 g of a solute that has a molar mass of 27.1 g/mol with 100.0 g of a solvent, wha...

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