Posted by **Duffy** on Tuesday, May 19, 2009 at 7:29pm.

Regarding the question I posted earlier (How many mL of an impure liquid CS2 mixture (density 1.26 gmL-1) which contains 93.0% of CS2 by mass, must be burned to obtain 12.8g SO2?)>>volume is 6.49 mL

what volume of pure oxygen at 25.0 degrees C and 100 kPa would be consumed (assume the carbon content burns to CO2).

Thanks!

- Chemistry...part 2 -
**DrBob222**, Tuesday, May 19, 2009 at 7:55pm
Use PV = nRT

Remember T is Kelvin.

Use the mass CS2 and convert to moles for n. There are 101.325 kPa in 1 atm.

- Chemistry...part 2 -
**Duffy**, Tuesday, May 19, 2009 at 8:23pm
I can't seem to get the answer (7.43)

PV=nRT

100V= 0.107334995 (8.314) (298.15)

V= 2.66

Any ideas?

- Chemistry...part 2 -
**DrBob222**, Tuesday, May 19, 2009 at 9:23pm
Rule #1 before we talk about where you went wrong. Don't copy all those digits on the calculator. Use 0.1073 if you wish but no more.

Now for the problem.

How did you get the 0.1073 moles.

I would have started with the 12.8 g SO2 which is 12.8/64 = 0.200 moles SO2. Now convert that to moles O2 (which you didn't do) using the coefficients in the balanced equation.

0.200 moles SO2 x (3 moles O2/2 moles SO2) = 0.300. Now plug that in. I get 7.436 liters which rounds to 7.44 L. I get 7.43 if I use 298 instead of 298.15 for T and 298.15 isn't justified.

## Answer this Question

## Related Questions

- Chemistry - How many mL of an impure liquid CS2 mixture (density 1.26 gmL-1) ...
- chemistry - If 8.29 L of gaseous Cl2 measured at STP and 0.380 mol of liquid CS2...
- Chemistry - If 45.3 mL of liquid CS2 and 7.62 L of gaseous O2 measured at STP ...
- Chemistry - CS2(g) + O2(g) CO2(g) + SO2(g) (a) Consider the unbalanced equation...
- chemistry - When CS2(g) (545.0 grams) and 57.71 grams of H2(g) in a 200.0 L ...
- chemistry due soon - Which reaction shows that the enthalpy of formation of CS2...
- Kainantu sec..science(chemistry) - At stp what volume of SO2 gas will be ...
- chem - determine the mass (g) of SO2 that is produced byt the reaction of 15g of...
- Comlumbus - Used the following equation to answer the question below : 5C(s)+...
- chemistry - Identify the limiting reagent and the volume of product formed with ...

More Related Questions