Posted by Lucy on Sunday, January 28, 2007 at 8:07pm.
Please could you tell me if I am going in the right direction.
I am trying to write molecular formula for As2O3
I make molecular mass 197.8
gas density 17.8 to 3 sig figs
2.0 x density of gas at STP / density of hydrogen
17.8/0.0899 = 396 to 3 figs
How do I go about matching it to molecular mass? I can see that 396/2=198 but if that's the right way I need to understand how I arrived at that point? I would be very grateful for some advise.
I am confused by the reference to H2 and the 2.0 x value. Was that an experiment you performed.
Is that 17.8 g/L (no units mentiioned), if so, then multiply by 22.4 L/mol = 398.7 for the molar mass. Check my thinking. Or have I missed something?
Relative molecular mass of gas =
2.0 X (density of gas) at STP/ density of hydrogen gas at STP
17.8g/l
Im trying to determine molcular formula
to match it to the empiricalformula in its gaseous state
You need to multiply the density of the gas by the molecular mass of oxygen which is 3 x 16 x 17.8 then divide by density of oxygen at STP which should show you that the empirical formula is nearly the same as the molecular formula i.e. as2o3
Well this is wrong but serves you right S103 student for cheating
No one has answered this question yet.
Answer this Question
Related Questions
Molecular formula - I have to find the molecular formula for As2O3, to do so I ...
chemistry - hi, Can you please double check to see if i have got this right? Is ...
chemistry - I need to know if I have th right molecular formula for Sorbito 39....
chemistry - what is the molecular formula of oxide of arsenic in its gaseous ...
Chemistry - Thermal Decomposition What is the ratio of moles of CuO produced per...
chem - Urgent, please help - 0.702g arsenic combines with 0.225g of oxygen to ...
Chemistry (Check) - True or False The empirical formula of a compound is always ...
chemistry - I need to know the molecular formula of oxide of arsenic when in its...
chem - could anyone tell me why the molecular formula of agas is not always the ...
Chemistry - Hi Please help verify my answer to the following question: 0.500g of...
For Further Reading
