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3 years ago

(science)

Chemistry

1 answer:

Artyom0805 [142]3 years ago

4 0

Answer:

Nicotine is classified as a stimulant drug.

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At 20 °C the vapor pressure of pure benzene (C6H6) is 75.0 torr, and that of toluene (C7H8) is 22.0 torr. Assume that benzene an

8090 [49]

Answer:

mole fraction benzene = 0.62

mole fraction toluene = 0.38

Explanation:

Raoults law for ideal solutions tells us that the totoal vapor pressure of the solution will be given by adding the partial pressures of the components of the solution and the partial pressures are simply given by the product of the component in solution times its pure vapor pressure at the temperature given:

<h2>p total = x₁ P⁰₁ + x₂ P⁰₂</h2>

where x1 and x2 for this solution denote the mole fractions of benzene and toluene and p⁰ ₁, p⁰₂ the vapor pressures of benzene and toluene respectively.

Solving the algebraic equation:

75 x₁ + 22 x₂ = 55

75 x₁ + 22 ( 1- x₁) = 55 (since x₁ + x₂ = 1)

75 x₁ + 22 - 22 x₁ = 55

53 x₁ = 33

x₁ = 0.62

x₂ = 1 - 0.62 = 0.38

6 0

3 years ago

What is the molar mass of a substance?

Masja [62]

<span>Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol. So probably A.)</span>

6 0

3 years ago

Read 2 more answers

Texture provides clues about how igneous rocks were formed A. true B. False

hammer [34]

A.) true

Because the rocks are formed near lava so the texture would be smooth

3 0

3 years ago

Compound X has a molar mass of 266.64 g/mol and the following composition: aluminum 20.24% chlorine 79.76% Write the molecular f

N76 [4]

Answer:

Explanation:

Assume we have 100g of this substance. That means we would have 20.24g of Cl and 79.76g of Al. Now we can find how many moles of each we have:

$\frac{79.76 \:g}{35.45 \: g/mol}$ = 2.25 mol of chlorine

$\frac{20.24 \: g}{26.98 \: g/mol}$ = 0.750 mol of Al.

To form a integer ratio, do 2.25/0.75 = 2.99999 ~= 3.

So the ratio is essentially Al : Cl => 1 : 3. To the compound is possibly $AlCl_3$ .

However, it says it has a molar mass of 266.64 g/mol, and since AlCl3 has a molar mass of 133.32, it must be $Al_2Cl_6$ .

Actually this molecule isn't exactly AlCl3 (which is ionic). Al2Cl6 forms a banana bond where Cl acts as a hapto-2 ligand. But that's a bit advanced. All you need to know is X = Al2Cl6

5 0

3 years ago

A car moving at 12 m/s applies its brakes and comes to a stop in 2 s. What was its acceleration?

vredina [299]

Answer:

Explanation:

The acceleration of an object given it's velocity and time taken can be found by using the formula

$a = \frac{v}{t} \\$

where

a is the acceleration

v is the velocity

t is the time

From the question we have

$a = \frac{12}{2} \\$

We have the final answer as

Hope this helps you

8 0

3 years ago