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photoshop1234 [79]
3 years ago
15

Name the type of reaction and give the coefficients needed to balance the following skeleton reaction: ___Mg + ___Fe2O3 → ___Fe

+ ___MgO A) synthesis with coefficients 3,1,2,3 respectively B) synthesis with coefficients 3,2,2,3 respectively C) single replacement with coefficients 3,1,2,3 respectively D) Single replacement with coefficients 1,1,2,3 respectively
Chemistry
1 answer:
posledela3 years ago
7 0

Answer:

C,

Explanation:

3Mg + Fe2O3 --->   2Fe + 3MgO

this is a single replacement reaction.

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Answer:

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A 0.552-g sample of ascorbic acid was dissolved in water to a total volume of 0.20 mL and titrated with 0.1103 M KOH. The equiva
Dmitry [639]

Answer:

176.1 g/mol , Ka = 10^{-3.984} =1.03 * 10^{-4}

Explanation:

The equation for the reaction is as shown in the attached diagram below

the reaction of Sodium Hydroxide, NaOH with ascorbic acid, C₆H₈O₆ is similar to the reaction of Potassium Hydroxide, KOH with ascorbic acid as show

C₆H₈O₆  +  KOH     ⇒     C₆H₇O₅K    +   H₂O

to produce one mole of potassium ascorbate and water

now,

0.1103 M KOH is contained in 1000mL

x moles is contained in 20mL

cross multiply making x the subject

No of moles of KOH = (0.1103 x 28.42)/1000 = 0.003135 moles

or

Moles KOH = 0.1103 x 0.02842 L = 0.003135  = moles ascorbic acid

Molar mass = 0.552 g / 0.003135 mol = 176.1 g/mol

Moles ascorbic acid = 0.552 / 176.1 =0.00313

moles NaOH = 0.0100 L x 0.1103 =0.001103

C₆H₈O₆ + OH⁻ >> C₆H₇O₆⁻ + H2O

Moles ascorbic acid in excess = 0.00313 - 0.001103 = 0.002027

Moles C₆H₇O₆⁻ = 0.001103

total volume = 20 + 10 = 30 mL = 0.030 L

concentration ascorbic acid = 0.002027 / 0.030 =0.0676 M

concentration C₆H₇O₆⁻ = 0.001103 / 0.030 =0.0368 M

pH = pKa + log [C₆H₇O₆⁻] / [C₆H₈O₆]

3.72 = pKa + log 0.0368 / 0.0676

3.72 = pKa - 0.264

pKa =3.984

Ka = 10^{-3.984} =1.03 * 10^{-4}

Ka = 10^-3.984 =1.03 x 10^-4

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