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3 years ago

6

One mole of a substance has the same number of particles as one mole of any other substance, regardless of what substances are b

eing compared.

1 answer:

katen-ka-za [31]3 years ago

3 0

This is a true statement

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A certain first-order reaction has a rate constant of 2.15×10−2 s−1 at 20 ∘C. What is the value of k at 55 ∘C if Ea = 72.0 kJ/mo

adell [148]

Answer:

$k_2=0.504s^{-1}$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the rate constant at 55 °C by using the temperature-variable version of the Arrhenius equation:

$ln(\frac{k_2}{k_1} )=-\frac{Ea}{R}(\frac{1}{T_2} -\frac{1}{T_1} )$

Thus, we plug in the temperatures, activation energy and universal constant of gases in consistent units to obtain:

$ln(\frac{k_2}{0.0215s^{-1}} )=-\frac{72000\frac{J}{mol}}{8.3145\frac{J}{mol*K}}(\frac{1}{55+273} -\frac{1}{20+273} ) \\\\ln(\frac{k_2}{0.0215s^{-1}} )=3.154\\\\k_2=0.0215s^{-1}exp(3.154)\\\\k_2=0.504s^{-1}$

Regards!

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3 years ago

Convert 0.85 x 10-12 km to nm.

vitfil [10]

Answer:

8,5 E10 nm

Explanation:

⇒ 0.85 E-2 Km * ( 1000 m / Km ) * ( 1 E9 nm / m ) = 8.5 E10 nm

⇒ 0.85 E-2 Km = 8.5 E10 nm

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If the empirical formula of a compound is C2H5 and the Molecular mass is 87g/mol what is the molecular formula?

frez [133]

C6H15, C2H5 has a molar mass of 29g/mol. 87 divided by 29 is 3. Then multiply each element subscript by 3

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The noble gases are located in which column of the periodic table?A. 1B. 6C. 9D. 18

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D IS THE ANSWER TO YOUR QUESTION

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Brums [2.3K]

Answer:

molecule

Explanation:

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2 years ago

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