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3 years ago

How many boron atoms are there in 5 molecules of BF3? Hint: The symbol for boron is B. Submit

Physics

2 answers:

Thepotemich [5.8K]3 years ago

8 0

Answer:

5 atoms of Boron

Explanation:

Boron makes up approximately 15.944% of the mass and the rest of the 84.056% is Fluorine. There is 5 Atoms because Boron atomic mass is 10.811 in 1 molecule of BF3 and you wanted 5 Molecules.

Drupady [299]3 years ago

6 0

Answer:

5 atoms of boron

Explanation:

it's because there is no number written next to the symbol 'B' so it means there's one boron so if we multiply it by 5 since there are 5 molecules it will give us the answer '5'.

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Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static fr

vredina [299]

Answer:

$2.0\cdot 10^2 N$

Explanation:

The cabinet does not move: this means that the net force acting on it is zero.

Along the horizontal direction, we have two forces:

- The push exerted by Bob, F = 200 N, forward

- The frictional force, $F_f$ , which acts in the opposite direction (backward)

Since the net force must be zero, we have:

$F-F_f = 0$

So solving the equation we can find the magnitude of the friction force:

$F_f = F = 200 N=2.0 \cdot 10^2 N$

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4 years ago

A linebacker strikes a fullback with full force in a football game.The reaction force to the force of the linebacker striking th

Scrat [10]

A. the back falls backwards to the ground

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3 years ago

A girl on roller skates accelerates at a rate of 2 m/sec/sec with a force of 100 N. What is her mass?

Dvinal [7]

By the newtons Second Law:

F = ma

Solving for m:

m = F / a

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<h3>m = 50 kg → ANSWER</h3>

8 0

3 years ago

Sort the sentences based on whether they describe radio waves, visible light waves, or both.

valentina_108 [34]

The electromagnetic spectrum includes a continuous spectrum of wavelengths that include:

Radio waves, microwaves, infrared light, visible, ultraviolet, X-rays, gamma rays

The wavelength decreases from radio waves to gamma rays, whereas the energy increases along the same direction.

In the given example, radio waves have a lower energy and higher wavelength than visible light. The latter can be perceived by the human eye, whereas radio waves are not visible to the human eye.

1) They have colors = visible light

2) They can travel in a vacuum = both

3) They have energy = both

4) They’re used to learn about dust and gas clouds = radio waves

5) They’re used to find the temperature of stars = visible light

6)They’re invisible = radio waves

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4 years ago

A sample of N-type silicon is at the room temperature. When an electric field with a strength of 1000V /cm is applied to the sam

V125BC [204]

Answer:

a) 222/cm^3

b) The Ec with respect to Ef and Ev = -0.107ev

c) Resistance, R = 467 ohms

Explanation:

(a) From the velocity and the applied electric field, we can calculate the mobility of holes:

υdp = µpε, µp = υdp/ε = 2×10^5/1000

= 200cm2/V.s

From a), we find Nd is equal to 4.5×1017/cm3

. Hence,

n = Nd = 4.5×10^17/cm3

, and p = ni^2/n

= ni^2/Nd

= 10^20 / 4.5×10^17 = 222/cm3

Clearly, the minority carrier is hole.

(b) The Fermi level with respect to Ec is

Ef = Ec - kTln(Nd/Nc) = Ec - 0.107 eV.

σ = q(µn n + µp p) ≈ qµn n = 1.6×10^-19 × 400 × 4.5×10^17 = 28.8/Ω-cm, and

ρ= σ

-1 = 0.035 Ω-cm.

Therefore, R = (0.035) × 20µm / (10µm× 1.5µm) = 467 Ω.

5 0

3 years ago

How many boron atoms are there in 5 molecules of BF3? Hint: The symbol for boron is B. Submit​

How many boron atoms are there in 5 molecules of BF3? Hint: The symbol for boron is B. Submit