In a 7.0 L evacuated chamber, 0.50 mole `H_(2)` and 0.50 mole `I_(2)` react at `427^(@)` C. According to reaction
`H_(2)(g)+I_(2)(g)hArr2HI(g)`
At the given temperature, `K_(c)=49` for the reaction. What is the partial pressure (atm) of HI in the equilibrium mixture?
A. 6.371
B. 12.77
C. 40.768
D. 646.58