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3 years ago

REVIEW 2. What three methods are used to represent the arrangement of electrons in atoms?

Chemistry

2 answers:

o-na [289]3 years ago

8 0

Orbital notation, electron configuration notation and noble gas notation

nasty-shy [4]3 years ago

4 0

Electron configuration is one I think plus to figure out you can use periods and groups

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Calculate the Molarity (M, moles solute / Liter of solution) of a solution that is made by dissolving 3.456 mmoles of Barium per

yan [13]

Since Molarity is moles per Liter, you will first need to convert the mL into L, which makes it 0.4321L. Next divide: moles on top, Liters on the bottom.
3.456 moles / .4321L = 7.998 M

3 0

4 years ago

32. A sample of potassium is composed of 23% K-39, 48% K-40 and the remainder K-41. Calculate the average mass

mario62 [17]

Answer:

40.06 amu.

Explanation:

From the question given above, the following data were obtained:

Isotope A (K-39)

Mass of A = 39 amu

Abundance of A = 23%

Isotope B (K-40)

Mass of B = 40 amu

Abundance of B = 48%

Isotope C (K-41)

Mass of C = 41 amu

Abundance of C = 100 – (23 + 48)

Abundance of C = 100 – 71

Abundance of C = 29%

Average mass =?

Average mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(39 × 23)/100] + [(40 × 48)/100] + [(41 × 29)/100]

= 8.97 + 19.2 + 11.89

= 40.06 amu

Thus, the average mass of potassium is 40.06 amu

7 0

3 years ago

The chemical reaction in this example is of environmental interest. Iron pyrite (Fesz) is often an impurity in

enot [183]

178.87 grams of sulphur dioxide is formed according to the equation given.

Explanation:

The balanced chemical reaction for the process is:

4 FeS2 + 11 O2 ⇒ 2Fe2O3(-) + 8 SO2

the reaction involving FeS and oxygen having balanced chemical equation as:

moles of oxygen given as 3.84

so when 11 moles of O2 reacts to form 8 moles SO2

3.84 moles of oxygen reacts to form x moles of SO2

$\frac{8}{11}$ = $\frac{x}{3.84}$

x = $\frac{30.72}{11}$

2.792 moles of sulphur dioxide will be formed

The mass can be calculated as number of moles x molar mass of 1 mole of SO2

= 2.792 x 64.066

= 178.87 grams of sulphur dioxide is formed.

7 0

4 years ago

The vapor pressure of ethanol at

Karo-lina-s [1.5K]

482VP I think is the correct answer.

5 0

3 years ago

Imagine a molecule with six total domains that are confined to two-dimensional space, so the electron group arrangement is hexag

tiny-mole [99]

Answer:

extra bonds don't count

Explanation:

4 0

3 years ago