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4 years ago

Your answer should contain numbers and l's b what value of l minimizes the volume in part a.?

Chemistry

1 answer:

Katyanochek1 [597]4 years ago

3 0

Need more details of the question. What was in part a?

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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.

6 0

3 years ago

What is the density of a solid that has a mass of 100g and a volume of 25mL.?

Arte-miy333 [17]

Answer:

D = 4 g/mL

General Formulas and Concepts:

Density = Mass over Volume

D = m/V

Explanation:

Step 1: Define

m = 100 g

V = 25 mL

D = unknown

Step 2: Find D

Substitute: D = 100 g/25 mL
Evaluate: D = 4 g/mL

7 0

3 years ago

Which one of the following questions about animals called affairs, pictured above, is the scientific question?

babymother [125]

The answer is B...

because any of the others could have an opinion based answer

5 0

3 years ago

Guess how many water molecules self-ionize in one liter of water! a) 7 moles b) 1 mole c) 10,000,000 moles d) 0.0000001 moles

Rudiy27

Answer:

Explanation:

This seems like a weird question

Water is held together by covalent bonds. The amount of energy required to break these bonds so that water would split into it's respective ions is pretty high. The chances that any one of the molecules floating in 1L of water get enough energy to spontaneously burst into it's ions is slim to none.

So, D) seems like the most likely answer

6 0

3 years ago

If you have 8.5 moles of Al2(SO4)3 how many grams of the compound do you have?

Zepler [3.9K]

Answer:

$RFM \: of \: aluminium \: sulphate = (2 \times 27) + (32 + (16 \times 4)) \times 3 \\ = 294 \\ 1 \: mole \: weighs \: 294 \: g \\ 8.5 \: moles \: weigh \: (8.5 \times 294) \: g \\ = 2499 \: g$

5 0

3 years ago