I am very confused on how to do this please read the following attachments

you will add then subtract to get the answer

fe 55.85 g/mol and h2o 18.02 g/mol.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )