The equation below shows the decomposition of lead(II) Nitrate. How many grams of oxygen are produced when 35.9 g of NO2 is formed?
2 Pb(NO3)2(s) --> 2 PbO(s) + 4 NO2(g) + 1 O2(g)

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive

Is it safe to take 450mg of diphenhydramine hydrochloride?