# A tank of gas has partial pressures of nitrogen and oxygen equal to #1.61 xx 10^4# #"kPa"# and #4.34 xx 10^5# #"kPa"#, respectively. What is the total pressure of the tank?

##### 1 Answer

#### Explanation:

The idea here is that when the volume and the temperature of a gaseous mixture are kept *constant*, the **total pressure** of the mixture is equal to the sum of the *partial pressures* of its gaseous components **Dalton's Law of Partial Pressures**.

In your case, you know that the mixture contains nitrogen gas,

#P_"total" = P_ ("N" _ 2) + P_ ("O"_ 2)#

Plug in your values to find

#P_"total" = 1.61 * 10^4color(white)(.)"kPa" + 4.34 * 10^5color(white)(.)"kPa"#

#P_"total" = color(darkgreen)(ul(color(black)(4.50 * 10^5color(white)(.)"kPa")))#

The answer is rounded to two **decimal places**, the number of decimal places you have for your values.