A gas collected when the pressure is 800mmHg has a volume of 3040 mL. What volume will the gas occupy at standard pressure?

Ithink that one is (c)

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m

Burned piece of steel wool does not gain mass. so only d could be true.