Answer:
The size of electric current must 104.5 Ampere.
Explanation:
Moles of electrons = 650 mmol = 
mmol = 0.001 mol
1 mol =
atoms/ions
Number of electrons = N
N = 
Charge on an electron = 
Total charge on N electrons = Q

Duration of time = T = 10 min = 10 × 60 s
1 minute = 60 seconds


The size of electric current must 104.5 Ampere.
[ H₃O⁺] = 10 ^- pH
[ H₃O⁺] = 10 ^ (- 5.75 )
[H₃O⁺] = 1.778x10⁻⁶ M
Kw = [ H₃O⁺] x [ OH⁻]
1x10⁻¹⁴ = 1.778x10⁻⁶ x [OH⁻]
[OH⁻] = 1x10⁻¹⁴ / 1.778x10⁻⁶
[OH⁻] = 5.62x10⁻⁹ M
hope this helps!
The breakdown of mass percentage of the elements is determined by dividing molar masses to the total molar mass of the compound (246.37 g/mol). There are four elements: for Mg: 9.87%, S:13.01%, H:5.69%, 71.44%.