I need help with converting

The air exhaled from the lungs of a smoker has a concentration of 24 ppm co. express the concentration as a percent.

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.