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motikmotik
3 years ago
5

If a sample of pure cadmium has a mass of 18.2 grams, how many moles of cadmium are in the sample?

Chemistry
1 answer:
Mars2501 [29]3 years ago
3 0
Atomic mass cadmium = 112.41 amu

1 mole Cd ------------ 112.41 g
?? moles Cd --------- 18.2 g

18.2 x 1 / 112.41 => 0.161 moles of Cd

hope this helps!
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How many sig-figs in the following measurements?
DerKrebs [107]

Answer:

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4 0
3 years ago
Which term is the symbol for the rate constant? A. [A] B. k C. R D. x + y E. None of the Above
Artemon [7]
Answer:
            Option-B (k) is the correct answer.

Explanation:
                   As we know the rate of reaction is given as;

                                                Rate  =  k [A]ˣ
Where;
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            x  =  order of reaction

So, from this equation we found that rate of reaction depends upon concentration and rate constant (k).
Now,
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                                            k  =  Ae^(Ea/RT) 

This equation is known as Arrhenius Equation, according to this equation rate constant depends upon Temperature and Activation energy. Greater the temperature greater is the rate constant and hence greater is the rate of reaction. Or smaller the activation energy greater is the rate constant and vice versa.
3 0
3 years ago
How much heat is released when 75 g of octane is burned completely if the enthalpy of combustion is -5,500 kJ/mol C8H18
AnnyKZ [126]
<span>Enthalpy change is the total heat that is absorbed or evolved in a certain reaction that is being carried in a constant pressure system. It can be calculated by the product of the specific heat of the substance and the difference of the final temperature and the initial temperature. For this case, the enthalpy of combustion is given, so we simply multiply the amount of octane present to the enthalpy given to determine the total heat that is released. 

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The negative sign in the calculated value represents that this heat is being released in the process.</span>
6 0
3 years ago
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nordsb [41]

Evolution can not be tested by experiment given that it depends largely on observations that fit into a wider scope and point to a common conclusion.

<h3>Can evolution be proven empirically?</h3>

Science is know to be empirical, In science, the evidence that backs up a claim is what establishes it as true or false. Thus all theories must be tested by experiment.

However, the theory of evolution can not be tested by experiment given that it depends largely on observations that fit into a wider scope and point to a common conclusion. In other words, evolution lies “outside of empirical science”.

The fact that it can not be directly proven empirically does not necessarily make it out to be false. That was the conclusion of Paul Ehrlich in his 1967 article.

Learn more about evolution:brainly.com/question/13492988

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2 years ago
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