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aleksklad [387]

3 years ago

14

Can somebody do a science project for me pls? I have ADD and im so confused I just can't do it. (the instructions are down below

, ill post the questions if anybody is up to it for 60 points and brainiest)

1 answer:

lawyer [7]3 years ago

4 0

answer this is so hard its impossible butt I'll ask my dad

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I NEED HELP HERE PLEASE !!!

Juliette [100K]

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Gas it too expensive I need to get a job. I have no money to use at the atm

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3 years ago

A vessel of volume 100ml contains 10% of oxygen and 90% of an unknown gas. The gases diffuses in 86 second through a small hole

swat32

The molecular weight of unknown gas : 23.46 g/mol

<h3>Further explanation</h3>

Given

A vessel contains 10% of oxygen and 90% of an unknown gas.

diffuses rate of mixed gas = 86 s

diffuses rate of O₂ = 75 s

Required

the molecular weight of unknown gas (M)

Solution

The molecular weight of mixed gas :(M O₂=32 g/mol)

$\tt 0.1\times 32+0.9\times M=3.2+0.9M$

Graham's Law :

$\tt \dfrac{r_{O_2}}{r_{mixed~gas}}=\sqrt{\dfrac{M_{mixed}}{M_{O_2}} }\\\\\dfrac{75}{86}=\sqrt{\dfrac{3.2+0.9M}{32} }\\\\0.76=\dfrac{3.2+0.9M}{32}\\\\24.32=3.2+0.9M\\\\21.12=0.9M\rightarrow M=23.46~g/mol$

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3 years ago

Which would increase the reaction rate?

murzikaleks [220]

Answer:

C. Adding a catalyst

Explanation:

Because the catalyst increases the rate of chemical reaction

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3 years ago

15.0 g of carbon dioxide (CO2)

Zanzabum

Answer:

I think that you want no, of moles

Explanation:

no, of mole of this amount= 15/44 = 0.341 mole

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We refer to astronauts in space as weightless, but not without mass. Why?

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