Answer:
Average speed or just speed
Explanation:
Average speed is the total distance an object travels divided by the total amount of time it took to travel the distance.
Answer:
divide the # of molecules by avogadros number and get 3.48 x 10^-6
Explanation:
Answer: 46.6 grams
Explanation:

Given : density of hexane = 0.660 g/ml
volume of hexane = 20 ml
Mass of hexane = 
moles of hexane =
According to stoichiometry :
2 moles of hexane reacts with 19 moles of oxygen
Thus 0.14 moles hexane will react with =
moles of oxygen
Mass of oxygen =
Thus minimum mass of oxygen required for the complete reaction of 20.0 mL of hexane is 46.6 grams.