Atmospheric pressure at sea level is equal to a column of 760 mm hg. oxygen makes up 21 percent of the atmosphere by volume. the partial pressure of oxygen (po2) in such conditions is atmospheric pressure at sea level is equal to a column of 760 mm hg. oxygen makes up 21 percent of the atmosphere by volume. the partial pressure of oxygen (po2) in such conditions is 21/760 16 mm hg 760/21 120/75 160 mm hg submitr

The partial pressure of oxygen is 160 mmHg

Explanation:

We are given:

Percent of oxygen in air = 21 %

Mole fraction of oxygen in air =

To calculate the partial pressure of oxygen, we use the equation given by Raoult's law, which is:

where,

= partial pressure of oxygen = ?

= total pressure of air = 760 mmHg

= mole fraction of oxygen = 0.21

Putting values in above equation, we get:

Hence, the partial pressure of oxygen is 160 mmHg

explanation: well the force of an object when it lands sitting on the ground isthe force of a wide rage of situations crucial to physics? ; ( i 'm trying my best to alot but im not smart enofe you for giving me this chance though! 3(

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.