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

Consider the following unbalanced equation for the combustion of hexane: αc6h14(g)+βo2(g)→γco2(g)+δh2o(g) part a balance the equation. give your answer as an ordered set of numbers α, β, γ, use the least possible integers for the coefficients. α α , β, γ, δ = nothing request answer part b determine how many moles of o2 are required to react completely with 5.6 moles c6h14. express your answer using two significant figures. n n = nothing mol request answer provide feedback

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?