Can someone please check-over my answers to these Chemistry problems?

Question

For the following questions, use the information given below.

Units of Pressure
Atmosphere (atm)	Kilopascals (kPa)	Millimeters of Mercury (mm Hg)	Torr (torr)
1.000 atm	101.3 kPa	760.0 mm Hg	760.0 torr

A container has 8360.0 torr of Nitrogen, 5.000 atm of Oxygen, 101.3 kPa of Argon, and 760.0 mm Hg of Carbon Dioxide.

1. What is the total pressure in the container (in atm)?

A. 8.000 atm

B. 12.00 atm

C. 15.00 atm

D. 18.00 atm

E. None of the Above

 2. What is the mole fraction of Nitrogen?

A. 0.0568

B. 0.1673

C. 0.6675

D. 0.6111

E. 0.7333

 3. What is the mole fraction of Carbon Dioxide?

A. 0.0556

B. 0.0670

C. 0.2567

D. 0.6676

E. 0.7572

 

4. What is the mole fraction of Oxygen?

A. 0.1673

B. 0.2670

C. 0.2778

D. 0.4675

E. 0.5782

Answer 1

I agree with all of your answers EXCEPT for #3, the mole fraction of carbon dioxide. The total pressure is 18 atm as answered in #1. The pressure of carbon dioxide is 760 mm which is equal to 1 atm. Thus, the mole fraction of carbon dioxide is 1 / 18 = 0.0556 (answer A).