$C{S}_2(g)+4H_2(g)C{H}_4(g)+2H_{2}S(g),K_c=0\mathrm{.}28at900C$

The four gases in the reaction above are mixed together in a reaction vessel at the following concentrations:

$[C{S}_2]=0\mathrm{.}30M,[H_2]=0\mathrm{.}60M,[C{H}_4]=0\mathrm{.}15M,[H_2(S)]=0\mathrm{.}25M{F}_2$ a myour answer

b$)?$

$($c$)$ What would the $K_c$ value be for $C{H}_4(g)+2H_{2}S(g)C{S}_2(g)+4H_2(g)$ at $900C?$