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3 years ago

0.836 m

Chemistry

1 answer:

Nataly_w [17]3 years ago

6 0

The force exerted on the Kite is 49.6 N.

Explanation:

Force is nothing but the product of pressure exerted by the wind on the kite and the area of the kite.

F = P × A

Where,

F is the Force in Newton = ?

P is the Pressure = 113 Pa = 113 N/m²

A is the Area of the Kite

A = 0.836 m × 0.525 m = 0.4389 m²

Now, we can find the force as,

F = 113 N/m² × 0.4389 m²

= 49.6 N [ ∵ In the units, m² gets cancelled]

So the force exerted on the Kite is 49.6 N.

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A sample of nitrogen gas is collected over water at temperature of 20.0˚C. What is the pressure of the nitrogen gas if atmospher

Levart [38]

Answer:

$P_N=0.987atm$

Explanation:

Hello there!

In this case, for these problems about collecting a gas over water, we must keep in mind that once the gas has been collected, the total pressure of the system is given by the atmospheric pressure, in this case 1.01 atm. Next, since we also have water in the mixture, we can write the following equation:

$P_T=P_w+P_N$

Thus, by solving for the pressure of nitrogen and using consistent units, we obtain:

$1.01atm=17.5torr*\frac{1atm}{760torr} +P_N\\\\P_N=1.01atm-0.023atm\\\\P_N=0.987atm$

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3 years ago

Why doesn’t a broken wineglass spontaneously fix itself, from a thermodynamic point of view?

Alla [95]

The answer is the option 3.) Fixing a wineglass requires a large decrease in entropy.

Entropy is a termodynamical variable and it is defined as the degree of disorder of the system.

As per the second law of thermodynamics the spontaneous changes only occur when the entropy increases.

Fixing the broken glasses by itself meant to decrease the entropy spontaneusly which violate the principle or second law of thermodynamics. So, it is not possible.

8 0

3 years ago

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Methylamine (ch3nh2) is a weakly basic compound. calculate the kb for methylamine if a 0.253 m solution is 4.07% ionized.

MariettaO [177]

Answer is: Kb for methylamine is 4.37·10⁻⁴.
Chemical reaction: CH₃NH₂ + H₂O → CH₃NH₃⁺ + OH⁻.
c(CH₃NH₂) = 0.253 M.
α = 4.07% ÷ 100% = 0.0407.
[CH₃NH₃⁺] = [OH⁻] = c(CH₃NH₂) · α.
[CH₃NH₃⁺] = [OH⁻] = 0.253 M · 0.0407.
[CH₃NH₃⁺] = [OH⁻] = 0.0103 M.
[CH₃NH₂] = 0.253 M - 0.0103 M.
[CH₃NH₂] = 0.2427 M.
Kb = [CH₃NH₃⁺] · [OH⁻] / [CH₃NH₂].
Kb = (0.0103 M)² / 0.2427 M.
Kb = 4.37·10⁻⁴.

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2 years ago

3. Which change of state involves adding thermal energy to a substance!

MakcuM [25]

Answer:

A) Melting

Explanation:

The three changes of phase described in this problem are:

Melting: melting occurs when a substance in solid state turns into liquid state. Since molecules in liquid state have more energy than molecules in solid state (because in liquids, molecules can slide past each other, while in solids they can't move, but only vibrate), thermal energy must be added in order to melt a substance

Freezing: freezing occurs when a liquid substance turns into solid state (the opposite of melting). Since molecules in liquid state have more energy than molecules in solid state, thermal energy must be removed from the substance in order to cause freezing
Condensation: condensation occurs when a gaseous substance turns into liquid state. Since molecules in gaseous state have more energy than molecules in liquid state, thermal energy must be removed from the substance in order to cause condensation

So the correct option is

A) melting

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3 years ago

In the combined gas law if a variable is not constant you can remove it from the equation to reveal the gas law you need to solv

devlian [24]

Answer:

False

Explanation:

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3 years ago

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