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3 years ago

What is a demonstration of the law of conservation of mass

Chemistry

1 answer:

IrinaVladis [17]3 years ago

6 0

Answer:

Explanation:

Law of Conservation of Mass: The law that states that matter cannot be created nor destroyed

Ex: Kelly ran across the room and bumped into her brother, pushing him to the floor. The kinetic energy she possessed because of her movement was transferred to her brother, causing him to move.

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Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points

Free_Kalibri [48]

523.15

brainliest please

I answerd

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2 years ago

A solution of sodium chloride in water has a vapor pressure of 19.6 torr at 25°C. What is the mole fraction of NaCl in this solu

Debora [2.8K]

Answer:

Mole fraction of Nacl is 0.173

Explanation:

we know that

$P_{sol}=\chi_{solvent}P^0_{solvent}$

where,

P sol - the vapor pressure of the solution

χ solvent - the mole fraction of the solvent

P ∘ solvent - the vapor pressure of the pure solvent

This means that in order to be able to calculate the mole fraction of sodium chloride, you need to know what the vapor pressure of pure water is at

25 ° C You can use an online calculator to find that the vapor pressure of pure water at 25 C is equal to about 23.8 torr .

$\chi_{water}= \frac{P{sol}}{P^0{water}}$

$\chi_{water}= \frac{19.6}{23.8}$

=0.827

Also we know that

$\chi_{water}+\chi_{Nacl}= 1$

This means that the mole fraction of sodium chloride is

χ_{Nacl}= 1-Χ_{water}

= 1-0.827 =0.173

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2 years ago

Convert 3.9x10^5mg to dg

bonufazy [111]

Thank you for posting your math problem here. To convert 3.9x10^5mg to dg the answer is 3.9 x 10^3 dg. Below is the solution:

Solution:

1mg=0.01dg
 dg= 3.9 X 10^5mg
dg = (3.9 X 10^5) x 0.01
dg = 3.9 x 10^3

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2 years ago

Read 2 more answers

Most metals allow electricity to flow freely through them. So, most metals are.....

algol [13]

Answer:

Conductors

Explanation:

Metals that are conductors let electric currents flow freely. Insulators have a resistance of a charge to flow through them.

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2 years ago

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T OR F

Murljashka [212]

Answer:

The statement is false. See the explanation below, please.

Explanation:

The hydrogen bond or bridge is a type of dipole-dipole interaction that is generated from the attraction of a hydrogen atom and a very electronegative atom (oxygen, fluorine or nitrogen). Examples of hydrogen bridge molecules: Water (H20), ammonia (NH3).

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2 years ago

What is a demonstration of the law of conservation of mass​

What is a demonstration of the law of conservation of mass