Butane C4 H10 (g), (Hf = - 125.7), combusts in the presence of oxygen to form CO2 (g) (Hf = - 393.5 kJ/mol), and H2O (g) (Hf = - 241.82) in the reaction: What is the enthalpy of combustion, per mole, of butane? Use

When chemists write out reactions, they often place numbers to the left of a chemical formula. e. g. the first 2 in: 2H+O-->H2O.

Why is RNA chemically unstable?

Which level of organization includes all the organisms on earth and all the non living things that they interact with? A) biome B) biosphere C) community D) ecosystem

When the liquid is poured through a filter ... ?

What happens to particles in diffusion?

2. What type of bond holds together nitrogen atoms? a. Single Bond b. Double Bond c. Triple Bond d. no bonds hold nitrogen together

Which acid-base pair will always undergo a reaction that produces a neutral solution? answer?

A chemical reaction is carried out in a closed container. The energy absorbed by the chemical reaction is 50 kJ. What is the energy liberated from the air or the walls of the container? A) 50 kJ B) 75 kJ C) 25 kJ D) 100 kJ

Draw the electron-dot structure for chclo. draw the molecule by placing the atoms on the grid and connecting them with bonds. include all lone pairs of electrons.

At stp 5.6 liters of ch4 which element contains the same number of molecules?