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kirill [66]
3 years ago
7

When an object is lifted 6 meters off the ground, it gains a certain amount of potential energy. If the same object is lifted 18

meters off the ground, its potential energy is A. six times as much. B. the same. C. three times as much. D. twice as much.
Chemistry
1 answer:
AlexFokin [52]3 years ago
7 0

Answer:

The answer to your question is the letter C. three times as much

Explanation:

Data

First step = 6 m

Second step = 18 m

Potential energy is the energy stored that depends on its position.

Formula

Pe = mgh

m = mass; g = gravity; h = height

Potential energy of the first step

        Pe1 = 6mg

Potential energy of the second step

        Pe2 = 18mg

-Divide the Pe2 by the Pe1

        Pe2/Pe1 = 18mg/6mg

                       = 3

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Answer:

Molar mass of solute is 183.4g/mol

Explanation:

Using Raoult's law it is possible to find moles of solute, thus:

P_{solution} = X_{solvent}P_{solvent}^0

Where pressure of solution is 53.15 mmHg, pressure of pure solvent is 54.68 mmHg and mole fraction is:

53.15 mmHg = X 54.68 mmHg

<em>0.9720 = X</em>

<em />

Mole fraction of solvent is defined as moles of solvent / total moles.

Moles of solvent are:

286.8g × (1mol / 46.07g) = 6.225 moles of ethanol.

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0.9720 = \frac{6.225mol}{Y+6.225mol}

<em>Where Y are moles of solute.</em>

6.051 + 0.9720Y = 6.225

0.9720Y = 0.174

Y = 0.179 moles of solute

As mass of solute dissolved was 32.83g. Molar mass of solute is:

32.83g / 0.179mol = <em>183.4g/mol</em>

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