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3 years ago

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15. How many elements had been discovered by 1942? 92 elements or a

1 answer:

vesna_86 [32]3 years ago

4 0

Answer:

94

Explanation:

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Factors that can affect the results of an experiment is a

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uranium hexafluoride is a solid at room temperature, but it boils at \(56^o C\).determine the density of uranium hexafluoride at

PSYCHO15rus [73]

<span>If it is known that at 60 °C and 745 torr UF₆ is present only as a gas then we can make the assumption that:

</span>(n/V) = P/RT = (745 torr)/(62.36 L-torr/mol•K)(337 K) = 0.0354 mol/L
Therefore the density will be:
<span>
Density = (352.02 g/mol)(0.0354 mol/L)/(1000 cm³/L) = 0.0125 g/cm³
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3 years ago

A diffusion coefficient KG was determined for the diffusion of a gas A through a stagnant film B [KG = 0.88 mol//h-ft2-atm].

Angelina_Jolie [31]

Explanation:

Transfer of mass A into stagnant film B depends on the availability of driving force.

Whereas driving force is the pressure difference at the surface of A and the bulk.

As, $N_{A} \propto (P_{A1} - P_{A2})$

$N_{A} = K_{G} \times (P_{A1} - P_{A2})$

Therefore, putting the given values into the above formula as follows.

$N_{A} = K_{G} \times (P_{A1} - P_{A2})$

= $0.88 \times (0.2 atm - 0.05 atm)$

= 0.132 $mol/h.ft^{2}$

Thus, we can conclude that the flux of A from a surface into a mixture of A and B is 0.132 $mol/h.ft^{2}$

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4 years ago

Next the students measured the density of aluminum metal. The accepted density for aluminum is 2.7 g/cm3. The students collected

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If Oxygen gains 2 electrons<br> what charge will it have?

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A very powerful one

Explanation:

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