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andriy [413]
3 years ago
9

Is nitrogen gas a pure substance or a mixture

Chemistry
1 answer:
Verizon [17]3 years ago
3 0
Its a mixture because nitrogen gas is air. Air is homogeneous mixture
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Calculate the molality of a 5.73 M ethanol (C2H5OH) solution whose density is 0.9327 g/mL.
Natalka [10]

Answer:

Molality = 8.57 m

Explanation:

Given data:

Molarity of solution = 5.73 M

density = 0.9327 g/mL

Molality of solution = ?

Solution:

Molality = moles of solute / kg of solvent.

Kg of solvent:

Mass of 1 L solution = density× volume

Mass of 1 L solution = 0.9327 g/mL × 1000 mL

Mass of 1 L solution = 932.7 g

Mass of solute:

Mass of 1 L = number of moles  × molar mass

Mass = 5.73 mol  × 46.068 g/mol

Mass = 263.97 g

Mass of solvent:

Mass of solvent = mass of solution - mass of solute

Mass of solvent = 932.7 g - 263.97 g

Mass of solvent = 668.73 g

In Kg = 668.73 /1000 = 0.6687 Kg

Molality:

Molality = number of moles of solute / mass of solvent in Kg

Molality = 5.73 mol /  0.6687 Kg

Molality = 8.57 m

4 0
3 years ago
Calculate Ho298 for the process
Inga [223]

Explanation:

As per the Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

Hence, according to this law the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

Sb + \frac{3}{2}Cl_2 \rightarrow SbCl_{3}    \Delta H^0_1 =  -314 kJ  ..........(1)

SbCl_{3} + Cl_2 \rightarrow SbCl_{5}    \Delta H^0_2 = -80kJ   ..............(2)

The final reaction is as follows:  

Sb + \frac{5}{2}Cl_{2} \rightarrow SbCl_{5}  \Delta H^0_3 = ?  .............(3)

Therefore, adding (1) and (2) we get the final equation (3) and value of \Delta H^{0}_{3} at 298 K will be as follows.

             \Delta H^{0}_{3} = \Delta H^{0}_{1} + \Delta H^{0}_{2}    

                       = -314 kJ + (-80) kJ

                       = -394 kJ

Thus, we can conclude that H^{o} at 298 K for the given process is -394 kJ.

4 0
3 years ago
The Average atomic mass
lina2011 [118]

Answer:

the average mass of the atoms of an element measured in an atomic mass unit

Explanation:

5 0
3 years ago
Which postulate of daltons atomic model was later changed and why
bearhunter [10]

Answer:

The postulate of Dalton's atomic theory that an atom is an indivisible particle and cannot be subdivided into smaller particles was later changed because atoms can be divided into neutrons, protons and electrons.

Explanation:

5 0
3 years ago
A very large redwood tree is measured to be about 100 units tall. Which unit is the most appropriate to use? A millimeters B cen
Kruka [31]

Answer:

The most appropriate unit to use for a redwood is:

  • <u>C. meters</u>.

Explanation:

The largest tree in the world is called Hyperion and it is a  <em>Sequoia sempervirens</em>, that is to say, a redwood, which measures a little more than 115 meters, when knowing this data first hand, you can imagine that <u>the vast majority of trees are usually measured in meters since their size is usually one meter in ahead (although you should know that there are some shrub species that can measure only centimeters, but being a minority, the meter unit is usually used)</u>.

7 0
3 years ago
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