Air is a mixture of 78% nitrogen, 21% oxygen and 1% other gases. The pressure of air is 1.013 x 105 Pa. What then, is the pressure of nitrogen in the air? Question 2 options:

1.01 x 103

2.12 x 104

7.9 x 104

7.9 x 105

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?