 OK, so let's do another gas law problem. This one actually is adult law problem. It says atmospheric sample contains nitrogen, oxygen, and argon. If the partial pressure of nitrogen is 587 millimeters of mercury, oxygen is 158 millimeters of mercury, and argon is 7 millimeters of mercury, what is the total pressure of this atmospheric sample? So remember, adult law is the total pressure equals, well, pressure 1 plus pressure 2 plus pressure 3. And if we've got more pressures, so on and so forth like that. So how many pressures do we have here? Just three, right? So the total pressure is going to be the pressure of nitrogen plus what? Pressure of oxygen plus pressure of argon. OK, so let's write that down. 1, 2, 8, oh, 2, 8. Normally, we would like to have our units in ATM, but with Dalton's law, it doesn't matter. OK, so we can leave them in millimeters of mercury, which is what I'm going to do. So 587 millimeters of mercury plus 158 millimeters of mercury plus 7 millimeters of mercury. So we're adding those three things up. And our units are going to be what, guys? There's a mercury. Yeah, OK, so 587 plus 158 plus 7. And I get a total pressure of 752, 752. Is there any questions on this one? Any questions? No. OK, are you sure? OK, wonderful.