2. (3points, Chapter 2, Problem 2.23) The composition of dry air at sealevel is 78.03% N2, 20.99% O2, and 0.033% CO2by volume. (a) Calculate the average molar mass of this air sample. (b) Calculate the partial pressure of N2, O2, and CO2in atm. (Hint: At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of the gas. Thus, % by volume

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.

What is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. potassium (k): 1s22s22p63s23p64s1