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3 years ago

11

Please can I have help on question e as I’m really stuck.I promise I’ll give out brainiest

1 answer:

Natasha_Volkova [10]3 years ago

5 0

The relative atomic mass of element A : 6.075 u

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% ...

Element A

mass number of isotope 1 = 6 , percent : 92.5%

mass number of isotope 2 = 7, percent : 7.5

Relative atomic mass of element A

$\tt = 92.5\%\times 6+7.5\%\times 7\\\\=5.55+0.525=6.075~u$

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Helen [10]

Answer:

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Explanation:

The differential equation is given as:

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Taking integral of both sides; we have:

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$r-kC=e^{-kt-kD}$

$r-kC=e^{-kt}e^{-kD}$

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If C(0)= $C_o$ ; we have:

C(0)= $\frac{r}{k}-\frac{A}{k}e^0$ (where; A is an integration constant)

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$A=r-kC_o$

Substituting $A=r-kC_o$ into equation (1); we have;

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4 years ago

What about these questions

Oksanka [162]

Again great job! They all look correct except 20. is 3.7 due to sig fig of least precision, which you have a mark by!! You don't even need help!;) Here comes the next chemical engineer! :)

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