The standard heat of formation of gaseous hydrogen bromide was first evaluated by means of the standard enthalpy values measured for the following reactions. The last three are standard heats of solution.

Write the thermochemical equation for the formation of 1 mol of HBr(g) from its elements, including its value for Hf°.

Equations are in the file

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

(1.6 × 10-19)(5.0 × 106) = c × 10d identify the missing numbers below to show the result of multiplying the numbers.

What happens in the particles of a gas when the gas is compressed