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3 years ago

Of the following, which can be used to identify an element present in a sample?

Chemistry

1 answer:

Anuta_ua [19.1K]3 years ago

6 0

Answer:

idk but i tryed

Explanation:

The simplest way to use the periodic table to identify an element is by looking for the element’s name or elemental symbol. The periodic table can be used to identify an element by looking for the element’s atomic number. The atomic number of an element is the number of protons found within the atoms of that element.

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What is the name for molecular compound N4O8?

zmey [24]

Tetranitrogen octoxide

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How many oxygen molecules are in 22.4 liters of oxygen gas at 273k and 101.3kpa?

babunello [35]

How many oxygen molecules are in 22.4 liters of oxygen gas at 273k and 101.3kpa

First solve the number of moles of the oxygen gas by using the ideal gas equation:

PV = nRT

Where n is the number of moles

n = PV/RT

n = (101 300 Pa) (22.4 L) (1 m3/1000 L ) / ( 8.314 Pa m3 / mol K) ( 273 K)

n = 1 mol O2

the number of molecules can be solve using avogrados number 6.022x10^23 molecule / mole

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Likurg_2 [28]

The correct answer to this question is letter "B. the battery
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The rule for controls is that

Nostrana [21]

Answer:

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Explanation:

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3 years ago

Which solution is the most concentrated?

kupik [55]

Answer:

2.5 M NaOH

Explanation:

The solution with the highest molarity is the most concentrated one.

Molarity is the number of moles per unit volume of a solution.

Molarity = $\frac{number of moles }{volume of solution}$

2.5M implies there are 2 mole of NaOH per solution of this given substance.

This is the highest from the list as other ones falls below it.

The lowest concentration is 0.2M because just 0.2 mole of NaOH is contained per unit volume.

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