1. Nitric acid is formed by the reaction of nitrogen dioxide with water. 3 NO2(g) + H2O(1) ► NO(g) + 2 HNO3(aq). How many moles of water are needed to react
with 8.4 mol NO2? Show calculation work. (2pts)

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here