1)What is the expression for Kc for the following reaction: Ti(s)+2Cl2(g)⇌TiCl4(l)

Kc=1/[Cl2]

Kc=1/[Cl2]2

Kc=[Cl2]2

Kc=[Cl2]

2)The following reaction is homogeneous or heterogeneous: Ti(s)+2Cl2(g)⇌TiCl4(l)?

3)The following reaction is homogeneous or heterogeneous: C(s)+2H2(g)⇌CH4(g)?

4)The following reaction is homogeneous or heterogeneous: 4HCl(aq)+O2(g)⇌2H2O(l)+2Cl2(g)?

5)What is the expression for Kc for the following reaction: 2C8H18(l)+25O2(g)⇌16CO2(g)+18H2O(g)?

Kc=[O2]/[CO2][H2O]

Kc=[O2]25/[CO2]16[H2O]18

Kc=[CO2]16[H2O]18/[O2]25

Kc=[CO2][H2O]/[O2]

6)The following reaction is homogeneous or heterogeneous: 2C8H18(l)+25O2(g)⇌16CO2(g)+18H2O(g)?

7) What is the expression for Kc for the following reaction: 2C8H18(l)+25O2(g)⇌16CO2(g)+18H2O(l)?

Kc=[O2]25/[CO2]16

Kc=[CO2]16/[O2]25

Kc=[CO2]/[O2]

Kc=[O2]/[CO2]

8)The following reaction is homogeneous or heterogeneous: 2C8H18(l)+25O2(g)⇌16CO2(g)+18H2O(l)?

I know its alot..but I dont know how to solve it an explanation would be awesome!

thanks :)