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2 years ago

How many moles of cacl2 are in 250 ml of a 3.0 m of cacl2 solution?

2 answers:

8 0

The appropriate response is Proximity. Purposes behind going out on a limb of living unlawfully in another nation are not just the normal upgrades in pay and living conditions yet, in addition, the expectation of in the long run being permitted to stay in the nation legitimately, as there might be a way to getting to be plainly naturalized. Living in another nation wrongfully incorporates an assortment of confinements, and additionally the danger of being kept and expelled or of confronting different authorizations

posledela2 years ago

7 0

To determine the number of moles of CaCl2 in 250 mL of a 3.0 M of CaCl2 solution, first note that the unit M refers to molarity which is a unit of concentration that means moles per liter of solution. Thus, simply convert 250 mL to liters then multiply it to 3.0 M. We then have:

250 mL x 1 L/1000 mL x 3 mol/L CaCl2 = 0.75 mol CaCl2

Thus, there are 0.75 mol CaCl2 in 250 mL of a 3.0 M of CaCl2 solution.

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Reserpine is a natural product isolated from the roots of the shrub Rauwolfia serpentina. It was first synthesized in 1956 by No

liraira [26]

Answer:

Molality = 0.066 m

Molar mass = 608.36 g/mol

Explanation:

It seems the question is incomplete. However a web search us shows this data:

" Reserpine is a natural product isolated from the roots of the shrub Rauwolfia serpentina. It was first synthesized in 1956 by Nobel Prize winner R. B. Woodward. It is used as a tranquilizer and sedative. When 1.00 g reserpine is dissolved in 25.0 g camphor, the freezing-point depression is 2.63 °C (Kf for camphor is 40 °C·kg/mol). Calculate the molality of the solution and the molar mass of reserpine. "

The freezing-point depression is expressed by:

ΔT=Kf * m

We put the data given by the problem and solve for m:

2.63 °C = 40°C·kg/mol * m

m = 0.06575 m

For the calculation of the molar mass: Molality is defined as moles of solute per kilogram of solvent:

0.06575 m = Moles reserpine / kg camphor

25.0 g camphor ⇒ 25.0/1000 = 0.025 kg camphor

We calculate moles of reserpine:

0.06575 m = Moles reserpine / 0.025 kg camphor

Moles reserpine = 1.64x10⁻³ mol

Finally we use the mass of reserpine and the moles to calculate the molar mass:

1.00 g reserpine / 1.64x10⁻³ mol = 608.36 g/mol

Keep in mind that if the data in your problem is different, the results will be different. But the solving method remains the same.

8 0

2 years ago

Gino made a table to describe parts of the electromagnetic spectrum. A 3-column table with 4 rows. The first column labeled wave

IgorC [24]

Answer:

D. Ultraviolet light should have a short wavelength, not a long wavelength.

Explanation:

just took the quiz on Ed

7 0

2 years ago

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The heat of fusion for ice is 334 joules per gram. Adding 334 joules of heat to one gram of ice at STP will

yulyashka [42]

C) change to water at the same temperature

Explanation:

Adding 334Joules of heat to one gram of ice at STP will cause ice to change to water at the same temperature.

The heat of fusion is the amount of energy needed to melt a given mass of a solid
It is also conversely the amount of energy removed from a substance to freeze it.
The addition of this energy does not cause a decrease or increase in temperature.
Only a phase change occurs.

Learn more:

Heat of fusion brainly.com/question/4050938

#learnwithBrainly

3 0

2 years ago

a 75.0 liter canister contains 15.82 moles of argon at a pressure of 546.8 kilopascals. What is the temperature of the canister?

abruzzese [7]

Pressure of argon = 546.8 kPa

Conversion factor: 1 atm = 101.325 kPa

Pressure of argon = 546.8 kPa x 1 atm/101.325 kPa = 5.4 atm

Moles of argon = 15.82

Volume of argon = 75.0 L

According to Ideal gas law,

PV = nRT

where P is the pressure, V is the volume , n is the number of moles, R is the universal gas constant, and T is the temperature

T = PV/nR = (5.4 atm x 75.0 L) / (15.82 x 0.0821 L.atm.mol⁻¹K⁻¹)

T = 311.82 K

Hence the temperature of the canister is 311.82 K.

4 0

2 years ago

Which object(s) formed last in our solar system?

AnnyKZ [126]

Long year ago In space, gravity attracts dust and gas together which created the young solar system. It pulled low-density cloud together to produce initially the solar nebula. These clouds are made of interstellar gas and dust.

The sun formed first from these nebula and dust.

Planetesimals is just a process indicates the formation of Earth and the other planets from concentrations of dust and diffused matter in the solar system.

Inner planets are the planets located closure to the sun in comparison to outer planets. These inner planets are mercury, venus, earth and mars. Thus, 4.5 billion year ago Inner planets formed at last.

5 0

2 years ago

Read 2 more answers