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3 years ago

Heat measures the average kinetic energy a substance's molecules. TRUE FALSE

Chemistry

1 answer:

hammer [34]3 years ago

7 0

Answer:

False this is like the definition of temperature

Explanation:

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Which one of the following compounds will NOT be soluble in water?

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See the correct answer is b.)PbS

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3 years ago

Please help ASAP<br><br> list three intermolecular forces from strongest to weakest

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3 years ago

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What two atoms are held together by a covalent bond in NaHCO3

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Answer: covalent bond is the force of attraction that holds together two atoms that share a pair of valence electrons. Covalent bonds form only between atoms of nonmetals. The two atoms that are held together in a covalent bond may be atoms of the same element or different elements.

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2 years ago

Need help ASAP PLS SCIENCE

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Answer:

m/s2

0.2

m/s2

Explanation:

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3 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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3 years ago