Agas with an empirical formula no2 has a molecular weight of 92.0g/mol. a possible molecular formula for the gas is a) no2 b) n2o3 c) n3o6 d) n2o5 e) n2o4

-

N₂O₄

Explanation: -

Emperical formula = NO2

Emperical formula mass = 14 x 1 + 16 x 2 =46 g /mol

Molecular weight = 92.0 g/mol

n =

=

= 2

Molecular formula = (Emperical formula)n

= (NO₂)₂

= N₂O₄

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

c. electrical charges of ionic bonds.