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3 years ago

What is the molecular formula of the molecule that has an empirical formula of C2H2O and a molar mass of 252.22 g/mol?

1 answer:

3 0

Ok I got it wrong I think but I'm too lazy to delete all my hard work soooo.... merry Christmas?
Molar masses of
C = 12.0107
H = 2.016
O = 15.999
Now what we gots tuh do is take the masses and add them together, but we have to add 2 carbons and 2 oxygens because we are trying to find the molar mass of the empirical formula. So...
2(12.0107)+2(2.016)+15.999
24.0214+4.032+15.999 = 44.0524
Now that we have the molar mass of the empirical formula, we divide the 252.22 by it.
252.22/44.0524 = 5.7254
72.0642+12.096+95.994

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$\frac {4.5 \ L * 1.63 \ atm}{2.4 \ atm}= V_2$

The units of atmospheres (atm) cancel.

$\frac {4.5 \ L * 1.63 }{2.4 }=V_2$

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The smallest number of significant figures in the original measurements is 2, so our answer must have the same. For the number we found, that is the tenths place.

The 5 in the hundredth place tells us to round the 0 up to a 1.

$3.1 \ L = V_2$

The volume of the neon gas when the pressure is changed to 2.4 atmospheres is <u>3.1 Liters.</u>

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