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3 years ago

Given the balanced equation:

Chemistry

2 answers:

PilotLPTM [1.2K]3 years ago

8 0

Answer: The correct answer is option 4.

Explanation:

$2C+3H_2\rightarrow C_2H_6$

According to the reaction, 1 mol of $C_2H_6$ is obtained from 2 moles of C gives

Then, 2 moles of $C_2H_6$ will be obtained from:

$\frac{2}{1}\times 2$ moles of C =4 moles

Hence, the correct answer is option 4.

ELEN [110]3 years ago

6 0

The answer is (4) 4.0 mol. This is a stoichiometry problem. You start with 2.0 mol of C2H6 and obtain the moles of C by multiplying 2.0 by the mole ratio, in this case 2. 2.0*2=4.0mol.

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According to de Broglie, which of these objects does not have a wavelength?

polet [3.4K]

Answer: Option D is correct.

Explanation: Equation given by de Broglie is:

$\lambda =\frac{h}{mv}$

where, $\lambda$ = wavelength of the particle

h = Planck's constant

m = mass of the particle

v = velocity of the particle

In option A, football will have some mass and is moving with a velocity of 25 m/s, hence it will have some wavelength.

In Option B, unladen swallow also have some mass and is moving with a velocity of 38 km/hr, hence it will also have some wavelength.

In Option C, a person has some mass and is running with a velocity of 7 m/hr, hence it will also have some wavelength.

As, the momentum of these particles are large, therefore the wavelength will be of small magnitude and hence, is not observable.

From the above, it is clearly visible that all the options are having some wavelength, so option D is correct.

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3 years ago

Drag each item to indicate whether it is related to Aristotle's or Ptolemy's model of the solar system, or to both. Some items m

Romashka-Z-Leto [24]

Answer:

Aristotle's Model :

geocentric

planets fixed on nested spheres

Ptolemy's model:

geocentric

planets fixed on epicycles

accurately predicted the positions of the planets

Explanation:

Let's begin by the fact both models are geocentric and make a brief explanation of them:

Aristotle's Model :

Aristotle built his model based on observations and philosophical assumptions, not on measurements or calculations, then he mistakenly thought the Earth was the center of the universe.

So, according to this model, the universe was spherical and finite, with the Earth immobile at its center, composed of the four fundamental elements (made up of spherical layers): ground, water, air and fire; and the Sun along with the fixed planets in their respective concentric spheres (also called nested spheres) revolving around the Earth.

Ptolemy's model:

Ptolemy's model of the universe was also geocentric, placing the Earth motionless in the center of the known universe and was the accepted model for a long time during the Middle Ages.

In this sense, ccording to Ptolemy's model of the universe our planet remains stationary while the other planets, the Moon and the Sun describe complicated orbits around it (called epicycles).

However, this model predicted with an acceptable accuracy for that time the motion of the known planets, until Copernicus appeared with the revolutionary Heliocentric model.

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3 years ago

What is the frequency of an electromagnetic wave that has a wavelength of

AlexFokin [52]

Answer:

D. 2.5 x 10 ^-14 Hz

Explanation:

Use wavelength formula: v = f x wavelength

Rearrange formula for frequency.

f = wavelength / v

f = 7.6 x 10 ^-6 / 3.00 x 10 ^8

f = 2.5 x 10^-14 Hz

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3 years ago

Determine the total mass of ethanol produced when 270 g of glucose reacts completely to form ethanol and 132 g of carbon dioxide

Mekhanik [1.2K]

Answer:

138g

Explanation:

270g-132= 138g

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The color, shape, volume, mass, etc.

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