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Nata [24]
3 years ago
5

The air in a hot-air balloon at 763 torr is heated from 14.0°C to 31.0°C. Assuming that the moles of air and the pressure remain

constant, what is the density of the air at each temperature? (The average molar mass of air is 29.0 g/mol.)
Chemistry
1 answer:
allsm [11]3 years ago
4 0

Answer:

1.237g/L = density at 14°C

1.167g/L = density at 31°C

Explanation:

Density is the ratio between mass and volume of a determined substance

From ideal gas law:

PV = nRT:

<em>Where P is pressure, V volume, n moles, R constant gas law, and T absolute temperature</em>

P/RT = n/V

You can obtain moles / L. now:

moles / L × (molar mass of the gas (g/mol)

g/L

<em>You can obtain the density of the gas in g/L</em>

763torr are:

763torr × (1atm / 760torr) = 1.004 atm

14°C and 31.0°C in absolute temperature are:

14°C + 273.15 = 287.15K

31°C + 273.15 = 304.15K

Replacing, density at 14°C:

1.004atm / (0.082atmL/molK×287.15K) × 29g/mol = density

1.237g/L = density at 14°C

And at 31.0°C:

1.004atm / (0.082atmL/molK×304.15K) × 29g/mol = density

1.167g/L = density at 31°C

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Explanation:

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Which of the following processes absorbs energy? A) condensation of water on a wind shield of a car B) formation of copperC) bal
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Answer:

C) ball rollinflown a hill

Explanation:

The question asks to  identify the endothermic process in the list of options. By way of elimination, we have;

A) condensation of water on a wind shield of a car

Condensation is an exothermic process. That is, heat is given out as the gases change into the liquid state of matter.

B) formation of copper

This is an exothermic process. Capture of electrons by a cation is always exothermic.

C) ball rollinflown a hill

This is the correct option. Energy is absorbed by the ball as it moves on the hill

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If you are using 3.00% (mass/mass) hydrogen peroxide solution and you determine that the mass of solution required to reach the
Maurinko [17]

Answer:

0.004522 moles of hydrogen peroxide molecules are present.

Explanation:

Mass by mass percentage of hydrogen peroxide solution = w/w% = 3%

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x=\frac{3\times 5.125 g}{100}=0.15375 g

Mass of hydregn pervade in the solution = 0.15375 g

Moles of hydregn pervade in the solution :

=\fraC{ 0.15375 g}{34 g/mol}=0.004522 mol

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5 0
3 years ago
Why do the pH scale generally range from 0 to 14 in aqueous solution?
zalisa [80]

Answer:

In aqueous solution the pH scale varies from 0 to 14, which indicates this concentration of hydrogen. Solutions with pH less than 7 are acidic (the value of the exponent of the concentration is higher, because there are more ions in the solution) and alkaline (basic) those with a pH higher than 7. If the solvent is pure water, the pH = 7 indicates neutrality of the solution

Explanation:

PH is a measure of how acidic or basic a liquid is. Specifically, from a dissolution. The acidity of a solution is essentially due to the concentration of hydrogen ions dissolved in it. In reality, the ions are not found alone, but are in the form of hydronium ions consisting of one oxygen molecule and three positively charged hydrogen. PH precisely measures this concentration. And to do it, we can use simple and very visual methods.

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