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A______Occouring________Solid that has a crystal structure and a definite______composition.

postnew [5]

Answer:

What are the answers.

Explanation:

7 0

3 years ago

Calculate the molar volume occupied by 1 mole of N2 using the van der Waals equation in the form of virial expansion at (a) its

dimulka [17.4K]

Answer:

Explanation:

Given that:

Pressure P = 10 atm

number of moles of N $_2$ = 1 mole

correction for the attractive force between molecule a = 1.352

correction for the volume of molecules b = 0.0387 L mol-1

Rate = 8.314

critical Temperature Tc= 126.3 K

Using van deer Waal equation:

$(p+ \dfrac{n^2a}{V^2} ) (V-nb)=nRT$

So for 1 mole of N $_2$ gas; we have

$(p+ \dfrac{a}{V^2} ) (V-b)=RT$

$(10+ \dfrac{1.352}{V^2} ) (V-0.0387)=8.314 \times 126.3$

Recall that: Tc = $\dfrac{ 8a}{27Rb}$

and

$Pc=\dfrac{a}{27b^2}$

Vc = 3b

Thus;

Vc= 3×(0.0387)

Vc = 0.1161m³

using the above Van der Waal equation, the value of V can also be determined, but in several situations, we abandon the term of (V - nb) and sometimes abandon $(p+n^2*\dfrac{a}{V^2})$ depending on the circumstances.

6 0

3 years ago

Which of the following statements about semi-empirical methods are true?

juin [17]

Answer:

a

Explanation:

The correct statement about semi-empirical methods is

It combines a theoretically sound model of bonding with some experimentally determined parameters.

These methods are typically referred to by acronyms which encode some of the underlying theoretical assumptions.

5 0

2 years ago

Recall that you're hypothesis is that these values are the fractions of atoms that are still radioactive after n half life cycle

Sergeu [11.5K]

A= 0.5, B = 0.25 , C = 0.125, D = 0.015625 and E = 0.00390625

<h3>What is a hypothesis?</h3>

A research hypothesis is a statement of expectation or prediction that will be tested by research. Before formulating your research hypothesis, read about the topic of interest to you.

Half life of a substance is defined as the amount of time taken by the substance to reduce to half of its original amount.

Here n represents the number of half lives.

The amount of substance that remains after n half lives can be calculated using the given formula,

So when we have n =1,

Fraction of substance that remains = 0.5¹ = 0.5.

That means after first half life over, the amount of substance that remains is 0.5 times that of original.

Therefore we have A = 0.5

When n = 2, we have 0.5² = 0.25

So when 2 half lives are over, the amount of substance that remains is 0.25 times that of original

Therefore B = 0.25

When n = 3, we have 0.5³ = 0.125

So when 3 half lives are over, the amount of substance that remains is 0.125 times that of original.

Therefore we have C = 0.125

When n = 6 , we have 0.5⁶ = 0.015625

So D = 0.015625

When n = 8, we have 0.5⁸ = 0.00390625

Therefore E = 0.00390625

The values for A, B, C, D and E are 0.5, 0.25, 0.125, 0.015625 and 0.00390625 respectively.

Learn more about the hypothesis here:

brainly.com/question/17173491

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4 0

2 years ago

Ecologists use food web diagrams, like the one shown, as tools in their studies of different populations of organisms within an

Mice21 [21]

Ecologists use food web diagrams as tools in their studies of different populations of organisms within an ecosystem because it shows the feeding relationship between organisms in the ecosystem.

This is defined as the graphical representation of the feeding relationship which occurs between organisms in the ecosystem and helps to predict the outcome in the addition or removal of a species.

The food web also helps to determine the various ways in which energy flows and it usually starts from the producers which are the plants as a result of their photosynthetic ability which involves the conversion of solar energy to chemical energy.

There are various organisms in the ecosystem and the food web helps to provide a better understanding of their feeding habits and impact various factors will result in.

Read more about Food web here brainly.com/question/4656320

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4 0

1 year ago

Helpppppppppppp me pleaseeeeeee​

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