PLEASE HELP ME OFFERING 50 POINTS PLEASE ANSWER QUICK
A man went to a gas station and asked the attendant to inflate the low front tire. When the attendant finished, the constant(s) for the system is (are):
A. temperature and number of gas molecules
B. pressure only
C. number of molecules only
D. volume and pressure
E. none of these choices

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.