The compound which is obviously incorrect is dihydrogen oxide
The correct answer is C because a Controlled Experiment tests only one factor at a time and consists of a control group and one or more experimental groups.
There are 600 hours.
explanation
each day has 24 hours and we want to know how much hours is equivalent to 25 days so we multiply 24 times 25 which is 600.
P1V1=P2V2
(600/760)(.200)=(780/760)x
x=.1538L or 153.8mL
Stop her experiment and attempt to get accurate data before continuing from the start
