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Topic: Writing molecular formula from empirical  (Read 3259 times)

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Offline customx

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Writing molecular formula from empirical
« on: August 01, 2010, 11:12:31 PM »
I'm completely lost and have no idea how to approach this problem. It doesn't help that my teacher gave it as homework and there isn't even a similar problem in the book to compare it to

A compound has the empirical formula SF4. At 20.0 Celsius, .100g of the gaseous compound occupies a volume of 22.1 mL and exerts a pressure of 1.02 atm. What is the molecular formula of the gas?

I've only written the following:
T = 293 K
Mass = .1 g
V = 22.1 mL
P = 1.02 atm
Molar mass of SF4 = 108.65g

Can someone point me in the right direction please? thanks

Offline opti384

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Re: Writing molecular formula from empirical
« Reply #1 on: August 02, 2010, 02:30:53 AM »
A little hint is that you have to find out the molar mass of the compound in order to determine the molecular formula from the empirical formula

Offline MOTOBALL

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Re: Writing molecular formula from empirical
« Reply #2 on: August 03, 2010, 07:39:49 PM »
The next step is to remember that 1 mole of a gas occupies 22.4 L at STP (standard temp. & pressure).

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