What is the percent by mass of hydrogen in CH3COOH (formula mass = 60.)? A) 7.1%
B) 5.0%
C)6.7%
D)1.7%
15 points pls answer quick it's timed I don't need explanation

An engineering team designs a new rocket that is faster and lighter than any other model being produced. however, the materials end up being so expensive that no company can afford to buy them. which step of the engineering process should have addressed this problem? a. know the background. b. evaluate the results. c. identify a need. d. do the work.

What happens to isotopes that are unstable?

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that