No_2 decomposes by the following reaction: 2 no_2(g) → 2 no(g) + o_2(g) the rate constant at 273 k is 2. 3 x 10^{-12} m^{-1}s^{-1}, and e_a is 111 kj/mol. How many seconds will it take for the partial pressure of no_2(g) to decrease from an initial pressure of 2. 5 atm to 1. 5 atm at 500 k?.

The ancestors of horses possessed feet with five digits. over time, with the development of grasslands, the digits fused and formed hooves. what evolutionary advantage did this transformation serve? a. it allowed them to climb rocky surfaces with ease. b. it allowed them to graze better. c. it enabled them to run faster from predators. d. it let them see clearly through the grasslands. e. it made them taller.

After studying french for 5 yearscin school, i was shocked to discover when i went to france that i couldn't even get a glass of water without a lot of sign language what is the author main point

Land is to arable ; river is a, navigable b, shallow c, presumsor d, water