3 years ago

HELP ME PLEASE!!!!

Chemistry

2 answers:

KonstantinChe [14]3 years ago

5 0

The correct answer is a.

sergey [27]3 years ago

5 0

2 moles of oxygen ATOMS

Your best answer is B. 2 moles

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Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drug

DanielleElmas [232]

Answer:

118.75°C is the boiling point of a solution.

Explanation:

Mass of the solute that is barbiturates = 42.5 g

Molar mass of a solute = 184.2 g/mol

Moles of solute = $\frac{42.5 g}{184.2 g/mol}=0.2307 mol$

Mass of the solvent that acetic acid = 825 g = 0.825 kg

$molality=\frac{\text{Moles of solute}}{\text{Mass of solvent}}$

Molality of the solution (m):

$m=\frac{0.2307 mol}{0.825 kg}=0.2796 m$

Elevation in boiling point is given as:

$\Delta T_b=i\times K_b\times m$

i = 1 (organic compound)

$=1\times 3.07^oC/m\times 0.2796 m=0.8585^oC$

$\Delta T_b=T_b-T$

$T_b$ = Boiling temperature of solution.

T = boiling temperature of solvent that is acetic acid=117.9°C

$0.8585^oC=T_b-117.9^oC$

$T_b=118.75 ^oC$

118.75°C is the boiling point of a solution.

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3 years ago

___ may be rinsed over materials to was off explosive residue. A) water B) bleach C) acid D) acetone

Sergio [31]

Answer: D.

Explanation: D. Acetone, Acetone may be rinsed over materials to wash off the explosive residue.

Hope this helps :)

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3 years ago

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Elements in the periodic table are listed in order of their -----

sattari [20]

Answer:

In numerical order left to right, they are arranged by the number of protons in the nucleus of a single atom of each element

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The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope

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Th emost abundant isotope is Kr84

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4 years ago

Select the correct answer.

jonny [76]

Answer:

Brainstorm with colleagues

Explanation:

So you can have different ideas.

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