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vova2212 [387]
3 years ago
9

An unknown element, X, is a nonmetal that contains seven valence electrons. Element X most likely forms ___________ covalent bon

ds.
A) 1
B) 2
C) 3
D) 4
Chemistry
1 answer:
scZoUnD [109]3 years ago
4 0
A) 1 is the correct answer!
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What mass in grams would 5.7L of hydrogen gas occupy at STP?​
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Answer:  The correct answer is:  " 0.54 g " .

__________________________________________

Explanation:

Note that "hydrogen gas" is:  

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_________________________________________

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i.e. " 1 mol / 22.4 L " ;

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So:     " 5.7 L H₂ (g)  *  \frac{1 mol H_{2} }{22.4 L} *\frac{2.01588 g}{mol} =? ;

The "L" ("literes" cancel out to "1" ;  since "L/L = 1 ;

The "mol" (moles) cancel out to "1" ; since "mol/mol = 1 ;

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and we are left with:

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 [5.7 * 2.104588 g ] / 22.4  =  ?  g ;

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→ [ 11.9961516  g ] / 22.4 =

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 → since "5.7 L " has 2 (two) significant figures;  

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Hope this is helpful.  Wishing you the best in your academic endeavors!

_______________________________

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