In prehistoric times there were many volcanic eruptions in the oceans. Lava spilled into the ocean waters, turning into igneous rock. This was followed by mass extinctions of many organisms attached to the ocean floor. What is the MOST LIKELY reason for this?
A) Contact with the lava killed the organisms.
B) The lava from the volcanoes took the oxygen from the air.
C) In prehistoric times, there were very few organisms living in the oceans.
D) The hot lava from volcanic eruptions changed the temperature of the ocean.

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

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

Is this correct if not can u correct me