Example for next four problems: Compound formula: MgCl2

Element: Mg

# of Atoms: 1

Element: Cl

# of Atoms: 2

gram formula weight (g): 95.21

Compound Formula: HCI

Element H

# of Atoms: (Options are 1, 2, and 3)

Element: CI

# of Atoms: (Options are 1, 2, and 3)

gram formula weight (g): (Options are 36, 36.46, and 36.50)

Compound formula : HCl

Element H

# atoms:1

Elements Cl

#atoms : 1

gram formula weight (g) = 36.46

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

the correct answer would be d. hope this !