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Mrrafil [7]
3 years ago
12

A hypothetical element x has 3 naturally occurring isotopes: 41.20% of 21x, with an atomic weight of 21.016 amu, 50.12% of 22x,

with an atomic weight of 21.942 amu, and 8.68% of 24x, with an atomic weight of 23.974 amu. on the basis of these data, calculate the average atomic weight of element x. report your answer to two decimal places.
Chemistry
1 answer:
iogann1982 [59]3 years ago
4 0
The average atomic weight is calculated by adding up the products of the percentage abundance and atomic weight. In this item, we have the equation,

     A = (0.412)(21.016 amu) + (0.5012)(21.942 amu) + (0.0868)(23.974 amu)

Simplifying the operation will give us the answer of 21.74 amu.

<em>Answer: 21.74 amu</em>
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How many grams of NaCL are required to prepare 50ml of a 2.0 molar solution​
Ksivusya [100]

Answer:

5.85 gm.

Explanation:

We know that,

Normality =<u> Molarity × Molecular </u><u>weight</u>

Equivalent weight

Since molecular weight of NaCl= equivalent weight = 23+35.5 =58.5

Normality of NaCl= molarity=2

Now,

Normality= <u>weight</u><u> </u><u>in</u><u> </u><u>gram</u><u> </u><u>×</u><u>1000</u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u>

Volume ×equivalent weight

Weight in gram is given by,

<u>=</u><u>Normality × Volume × equivalent </u><u>weight</u>

1000

= <u>2× 50 × 58.</u><u>5</u>

1000

=5.85 gm.

4 0
3 years ago
Which area is most likely to support a marsh ecosystem?.
andriy [413]

Answer:

A location that is humid, would most likely support a marsh ecosystem.

Explanation:

The Florida Everglades are an example of a marsh :)

"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."

5 0
2 years ago
List a few ways that would lead you to believe a chemical reaction has occurred
iren2701 [21]
There are many ways which can <span>lead us to believe a chemical reaction has occurred. I am discussing few of them.

Change in Color:
                          Few reactions proceed with the change in colour. When Bromine Water (yellow-Brown) is treated with unsaturated compounds, the color disappear as the reaction is completed.

Gas Production:
                         Some reactions proceed with the elimination of gas i.e. CO</span>₂ , H₂, N₂, H₂O e.t.c. 

Temperature Change:
                                 Some reactions evolve or absorb heat when proceed. This change is the evidence of progress of reaction.

Thin Layer Chromatography:
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Instrumental Techniques:
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5 0
3 years ago
a gas measured a volume 100 mL under pressure of 740 mmHg. What would the volume be under a pressure of 780 mmHg with constant t
nikdorinn [45]

Answer:

<h2>94.87 mL</h2>

Explanation:

The new volume can be found by using the formula for Boyle's law which is

P_1V_1 = P_2V_2

Since we're finding the new volume

V_2 =  \frac{P_1V_1}{P_2}  \\

We have

V_2 =  \frac{100 \times 740}{780}  =  \frac{74000}{780}  \\  = 94.8717...

We have the final answer as

<h3>94.87 mL</h3>

Hope this helps you

7 0
2 years ago
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Bas_tet [7]

Answer:

The number and the kinds of atoms in the compound

Explanation:

  • A chemical formula of a compound contains symbols o the atoms of the elements present in the compound as well as the number of atoms of each element in the form of subscripts.
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5 0
3 years ago
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