3 years ago

Please someone answer this for me ASAP

Chemistry

1 answer:

Alex777 [14]3 years ago

6 0

Answer:

I'm not 100% sure but I think it is b I'm not great with math tho

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calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?

Stells [14]

Answer:

$0.15008\ \text{g}$

$3.23\times 10^{21}$

Explanation:

1 mol of nitrogen at STP = 22.4 L = 22400 cc

n = Mol of $N_2$ = $\dfrac{120}{22400}=0.00536\ \text{mol}$

M = Molar mass of $N_2$ = $28\ \text{g/mol}$

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

Mass of $N_2$ is

$m=nM\\\Rightarrow m=0.00536\times 28\\\Rightarrow m=0.15008\ \text{g}$

Mass of the nitrogen is $0.15008\ \text{g}$

Number of molecules is given by

$nN_A=0.00536\times 6.022\times 10^{23}=3.23\times 10^{21}\ \text{molecules}$

The number of molecules present in it are $3.23\times 10^{21}$

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3 years ago

What three tests must all theories pass to be considered a "proven" theory?

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In order to become a scientific theory the three categories that it must pass are the following:

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3) Is the phenomena truly natural or was it the result of a man-made force enacting upon it?

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Which is the smallest particle into which a compound can be broken down and still remain the same compound? A. atom B. mixture C

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The smallest would be a compound

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What is the molarity of a 500.0 ml solution containing 0.75 moles of solute?

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