What volume of hydrogen (in L) is produced from the complete reaction of 56.49 g of magnesium metal at stp? (Mg= 24.30 g/mol)

Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)

Hint: 1 mole of gas at stp occupies 22.4 L

Compound with sulfer  is bright red 

The ratio is 3: 2. i.e. 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