Chemistry check Please
posted by Mike
The question is: Find the following quantities
the volume, in liters, of 835 g SO3 at STP
My answer is:
1 mol of SO3=80g
835g/80g = 10.44 mols
v = (10.44 x 8.314 x 273)/100 = 236 L
Can someone tell me if I did it correct. Thanks very much.

DrBob222
I think you should have used 101.3 kPa for pressure and not 100, then the answer would have been about 234 L. An easier way is to remember a mole of a gas at STP occupies 22.4 L; therefore,
10.44 mol x (22.4 L/mol) = about 234.. I would also suggest that if you have 3 significant figures in the 835 that you should have used at least 3 places in the molar mass of SO3. I would have used 80.064, don't clear the calculator, multiply by 22.4, then round to 3 places. 
Mike
Thank you. So I would have:
1 mol of So3 = 80.064
835g / 80.064g = 10.44
v = (10.44 x 80.064 x 273) / 101.3 = 234 L 
DrBob222
If you wished to use the ideal gas law, yes.

Mike
Thank you so much for your time and explanation
Respond to this Question
Similar Questions

Chemistry
Can you show me how to do this? 2KClO3 > 2KCl + 3O2 If 5.0(g) of KClO3 is decomposed , what volume of O2 is produced at STP? 
Chemistry
A gas sample containing only SO3, CH2O and C2H6O2 has the following mass percent composition: 65.1% SO3 and 8.79% CH2O. Calculate the partial pressure (torr) of SO3 if the total pressure of the sample is 4712 torr. Unit conversion … 
Chemistry
How to make into compounds to get a formula? 
chemistry
How to make into compounds to get a formula? 
Chemistry
Given 175 liters of SO3 at 800 torr and 100 degrees C, find the volume at STP, give the mass of the sample and give the number of molecules in the sample. Can somebody please explain how I figure this out? 
Chemistry
An equilibrium mixture of SO2, O2, and SO3 at 1000 K contains the gases at the following concentrations: [SO2] = 3.77 103 mol/L, [O2] = 4.30 103 mol/L, and [SO3] = 4.13 103 mol/L. Calculate the equilibrium constant, K, for the following … 
chemistry
An equilibrium mixture of SO2, O2, and SO3 at 1000 K contains the gases at the following concentrations: [SO2] = 3.77 103 mol/L, [O2] = 4.30 103 mol/L, and [SO3] = 4.13 103 mol/L. Calculate the equilibrium constant, K, for the following … 
chemistry (Pls Bob check for me)
0.5g of fuming h2s04 oleum is diluted with water. This solution is completely neutralized by 26.7ml of 0.4N naoh. Find the percentage of free so3 in the sample My calculation h2s04 = 98g/mol s03 = 80g/mol 98/2 = 49 80/2 = 40 26.7ml … 
Chemistry
2 SO2 (g) + O2 (g) → 2 SO3↑ Assuming STP, how many grams of oxygen are needed to produce 19.8 liters of SO3? 
science
How many litres of oxygen are needed to react completely with 25.0L of H2S at STP according to the following reaction: 2H2S + 3o2 > 2so2 + 2H2O At STP temperature is 273 K pressure is 101.3 Kpa R is 8.314 so PV=nRT 101.3×25= …