17. Determine the mole ratio of aluminum chloride to hydrochloric acid in the following unbalanced chemical equation:
AICI + H2504 HCI + Al2(SO4)3
a. 1:1
b. 1:2
C. 2:6
I
d. 4:6

18. Determine the number of molecules in 2.50 grams of carbon dioxide gas, CO2-
a. 2.92 x 1023 molecules of CO2
b. 1.83 x 1022 molecules of CO2
c. 3.42 x 1022 molecules of CO2
d. 6.62 x 1025 molecules of CO,

not clear

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.