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Lisa [10]
4 years ago
12

Two Chemistry questions 30 points

Chemistry
1 answer:
coldgirl [10]4 years ago
6 0

Answer:

999

Explanation:

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Calculate the pressure in atmospheres of 0.5 mol of Helium ( He) at 20°C & occupying 2.50 L.
Morgarella [4.7K]

Answer:

4.811 atm.

Explanation:

  • We can use the general law of ideal gas:<em> PV = nRT.</em>

where, P is the pressure of the gas in atm (P = ?? atm).

V is the volume of the gas in L (V = 2.5 L).

n is the no. of moles of the gas in mol (n = 0.5 mol).

R  is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 20°C + 273 = 293 K).

<em>∴ P = nRT/V =</em> (0.5 mol)(0.0821 L.atm/mol.K)(293 K)/(2.5 L) = <em>4.811 atm.</em>

7 0
3 years ago
Which orbital that would never exist in the quantum description of an atom is _____.
Anton [14]

Answer:

C. 2s

Explanation:

the "s" orbital is only possible at an energy level of n = 1. 2s means the energy level is at n = 2 and that's not possible for the "s" sublevel.

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Ethanol is more inflammable.
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Are the following instructions for diluting a 10.0 M solution to a 1.00 M solution correct: ""Take 100.0 mL of the 10.0 M soluti
Molodets [167]

The following directions for diluting a 10.0 M answer to a 1.00 M solution is no longer correct.

<h3>.What is the rule of dilution?</h3>

A popular rule to use in calculating the attention of solutions in a sequence is to multiply the unique concentration by means of the first dilution factor, this by the second dilution factor, this by the 1/3 dilution factor, and so on till the ultimate attention is known.

Example: A 5M answer of HCl is diluted 1/5.

<h3>How do you do a 1 in 10 dilution?</h3>

For example, to make a 1:10 dilution of a 1M NaCl solution, you would combine one "part" of the 1M solution with 9 "parts" of solvent (probably water), for a total of ten "parts." Therefore, 1:10 dilution ability 1 part + 9 components of water (or different diluent).

Learn more about dilution here:

<h3>brainly.com/question/25292980</h3><h3 /><h3>#SPJ4</h3>
7 0
2 years ago
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