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2 years ago

An airplane flies at a constant speed of 920 km/h. How long will it take the plane to travel a distance of 1150 km?

Chemistry

2 answers:

rewona [7]2 years ago

5 0

Answer:

1.25 hours or 75 minutes or 1 hour and 15 minutes

Explanation:

elixir [45]2 years ago

4 0

Hello,

given distance / unit rate

(1150 km) / 920 km/h) = 1.25 h
km will cancel out, leaving hours

Good luck to you!

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Toluene (C6H5CH3 ), an organic compound often used as a solvent in paints, is mixed with a similar organic compound, benzene (C6

Sergeeva-Olga [200]

Explanation:

The given data is as follows.

Weight of solute = 75.8 g, Molecular weight of solute (toulene) = 92.13 g/mol, volume = 200 ml

Therefore, molarity of toulene is calculated as follows.

Molarity = $\frac{\text{weight of solute}}{\text{molecular weight of solute}} \times \frac{1000}{\text{volume of solution in ml}}$

= $\frac{75.8 g}{92.13 g/mol} \times \frac{1000}{200 ml}$

= 4.11 M

Hence, molarity of toulene is 4.11 M.

As molality is the number of moles of solute present in kg of solvent.

So, we will calculate the molality of toulene as follows.

Molality = $\frac{\text{given weight of solute}}{\text{given molecular weight of solute}} \times \frac{1000}{\text{weight of solvent in grams}}$

= $\frac{75.8 g}{92.13 g/mol} \times \frac{1000}{95.6 g}$

= 8.6 m

Hence, molality of given toulene solution is 8.6 m.

Now, calculate the number of moles of toulene as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{75.8 g}{92.13 g/mol}$

= 0.8227 mol

Now, no. of moles of benzene will be as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{95.6 g}{78.11 g/mol}$

= 1.2239 mol

Hence, the mole fraction of toulene is as follows.

Mole fraction = $\frac{\text{moles of toulene}}{\text{total moles}}$

= $\frac{0.8227 mol}{(0.8227 + 1.2239) mol}$

= 0.402

Hence, mole fraction of toulene is 0.402.

As density of given solution is 0.857 $g/cm^{3}$ so, we will calculate the mass of solution as follows.

Density = $\frac{mass}{volume}$

0.857 $g/cm^{3}$ = $\frac{mass}{200 ml}$ (As 1 $cm^{3}$ = 1 g)

mass = 171.4 g

Therefore, calculate the mass percent of toulene as follows.

Mass % = $\frac{\text{mass of solute}}{\text{mass of solution}} \times 100$

= $\frac{75.8 g}{171.4 g} \times 100$

= 44.22%

Therefore, mass percent of toulene is 44.22%.

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3 years ago

If in the following diagram the substance is in the solid state during stage 1, what is happening during stage 2?

Iteru [2.4K]

If in the following diagram the substance is in the solid state during stage 1, during stage 2 the substance is boiling or condensing .
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</span>Condensation happens when the gas is changed into liquid.

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3 years ago

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Which organism is most likely 10 centimeters in size?

djyliett [7]

Answer:

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Explanation:

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slavikrds [6]

i believe the answer is a liquid

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3 years ago

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Zielflug [23.3K]

Answer:

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Explanation:

So D. Glad to help! :D

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2 years ago

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