How many milliliters of ozone gas at at 25.0°C and 1.00 atm pressure are needed to react with 45.00 mL of a 0.100 M aqueous solution of KI according to the chemical equation shown below?
O3(g) + 2 I-(aq) + H2O(l) → O2(g) + I2(s) + 2 OH-(aq)
This is the answer; 55.0 mL
ALL I NEED TO KNOW IS WHY AND HOW Kl IS THE SAME AS l- HOW IS THAT????
Very quick chemistry question!!!! Please help.?
2017-11-05 2:25 pm
回答 (3)
2017-11-05 2:40 pm
KI(aq) → K⁺(aq) + I⁻(aq)
1 mol of KI completely dissociates in aqueous solution to give 1 mole of I⁻.
Hence, No. of moles of KI dissolved = No. of moles of I⁻ in the solution
and also, concentration of KI in the solution = Concentration of I⁻ in the solution
No. of moles of I⁻ reacted = (0.100 mol/L) × (45.00/1000 mL) = 0.0045 mol
O₃(g) + 2 I⁻(aq) + H₂O(l) → O₂(g) + I₂(s) + 2 OH⁻(aq)
According to the coefficients of the equation, 2 moles of I⁻ react with 1 mole of O₃, i.e.
1 mole of I⁻ reacts with 1/2 mole of O₃.
No. of moles of O₃ reacted with 0.0045 mole of I⁻ = (0.0045 mol) × (1/2) = 0.00225 mol
Consider the O₃ gas :
Gas law : PV = nRT
Then, V = nRT/P
Volume of O₃ gas needed, V = 0.00225 × 0.08206 × (273 + 25.0) / 1.00 L = 0.0550 L = 55.0 mL
1 mol of KI completely dissociates in aqueous solution to give 1 mole of I⁻.
Hence, No. of moles of KI dissolved = No. of moles of I⁻ in the solution
and also, concentration of KI in the solution = Concentration of I⁻ in the solution
No. of moles of I⁻ reacted = (0.100 mol/L) × (45.00/1000 mL) = 0.0045 mol
O₃(g) + 2 I⁻(aq) + H₂O(l) → O₂(g) + I₂(s) + 2 OH⁻(aq)
According to the coefficients of the equation, 2 moles of I⁻ react with 1 mole of O₃, i.e.
1 mole of I⁻ reacts with 1/2 mole of O₃.
No. of moles of O₃ reacted with 0.0045 mole of I⁻ = (0.0045 mol) × (1/2) = 0.00225 mol
Consider the O₃ gas :
Gas law : PV = nRT
Then, V = nRT/P
Volume of O₃ gas needed, V = 0.00225 × 0.08206 × (273 + 25.0) / 1.00 L = 0.0550 L = 55.0 mL
2017-11-05 2:30 pm
When added to water, KI will decompose according to this dissociation reaction: KI → K+ and I-. That's where you get your Iodine ions from.
2017-11-05 2:28 pm
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收錄日期: 2021-04-18 18:04:35
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