Question

Gases question

Answer 1

Highway lighting is commonly done using sodium vapor lamps because of their low operating cost, high intensity output, and long life(typically 25000 hours).

One style of lamp is 16.5 inches in length and 3.0 inches in diameter (V=pir^2h). The lamp is filled with 20mmHg xexon and 0.57g sodium at 20 degrees Celsius.

(The vapor pressure of sodium is negligible at room temperature and 16.1 bar at 1300 degrees Celsius. 1in.=1.54cm)

Determine the total pressure at the operating temperature of 1300 degrees Celsius.

Answer 2

No matter what my prof's answer makes 0 sense.

Answer 3

well you're gonna use PV=nRT, right?

so find the volume, (I'm not sure why you're using inches but convert that sh*t to metric)

find the moles of sodium, convert the 20 mmHg of Xe into moles and add them to the moles of sodium?

Answer 4

Well the thing is I did all that but I am not getting the right answer. Here is what my prof did.

Answer 5

Where did he get that other mass of sodium from?

Answer 6

@aaronq

Answer 7

he used 0.025 g of sodium instead of 0.57g, i think he made a mistake

Answer 8

i don't see why he would use 0.025 g, that doesn't make sense

Answer 9

That's what i said.

Answer 10

ask him about it when you can