Ask Experts Questions for FREE Help !
Ask
    susus's Avatar
    susus Posts: 138, Reputation: 2
    Junior Member
    		  
    #1

    Nov 5, 2010, 03:55 PM
    Chemistry question about mass
    0.325g sample of gaseous hydrocarbon (consists of carbon and hydrogen only), occupies
    A volume of 193mL at 749mmHg and 26.1ºC. Determine the molecular mass, and draw a plausible Lewis structure for this hydrocarbon

    My question about this question what is
    "a volume of 193mL at 749mmHg and 26.1ºC"

    Other things I know how to do.. I just did not understand..
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
    Full Member
    		  
    #2

    Nov 5, 2010, 07:58 PM
    susus
    The numbers you have been given are the variables in the Ideal Gas Law (which is given in the question preceding yours). You have been given the volume and temperature - surely you recognise them; mmHg is the pressure of the gas in millimeters of mercury. Solve for moles, that will give you the Mol. Wt.
    There you go.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

My chemistry is due tomorrow and I really don't understand how to convert density mass [ 1 Answers ]

I need to convert 1.799kg/m^3 to g/cm^3 please help me.

Chemistry moles and mass question [ 3 Answers ]

this problem is kicking my butt cause we have multiple choice and I can't seem to get any of the posted answers... please help! A 0.0100-mol sample of urea, NH2CONH2, contains 4.82 x 1022 atoms. 4.82 x 1024 atoms. 6.02 x 1022 molecules. 4.82 x 1023 atoms. 6.02 x...

Chemistry Question [ 2 Answers ]

How do you develop a Time Clock used in an experiment when determining a rate of reaction?

View more questions Search