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4 years ago

Which of these molecules are carboxylic acids? check all that apply?

Chemistry

2 answers:

Svetllana [295]4 years ago

7 0

Carboxylic acid should contain COOH group

Gre4nikov [31]4 years ago

4 0

The given question is incomplete, the complete question is attached below.

Answer :

The correct option is, E.

Explanation :

Carboxylic acid is a functional group in which the the $-COOH$ group is directly attached to the end of alkyl group of carbon.

The general formula of carboxylic acid is, $R-COOH$

Aldehyde is a functional group in which the the $-CHO$ group is directly attached to the end of alkyl group of carbon.

The general formula of aldehyde is, $R-CHO$

Alcohol is a functional group in which the the $-OH$ group is directly attached to the end of alkyl group of carbon.

The general formula of alcohol is, $R-OH$

Hence, the correct option is, E.

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Given:

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Mass of Cl = 2.21 g

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To determine:

The enthalpy of formation of AgCl(s)

Explanation:

The reaction is:

2Ag(s) + Cl2(g) → 2AgCl(s)

Calculate the moles of Ag and Cl from the given masses

Atomic mass of Ag = 108 g/mol

# moles of Ag = 1.67/108 = 0.0155 moles

Atomic mass of Cl = 35 g/mol

# moles of Cl = 2.21/35 = 0.0631 moles

Since moles of Ag << moles of Cl, silver is the limiting reagent.

Based on reaction stoichiometry: # moles of AgCl formed = 0.0155 moles

Enthalpy of formation of AgCl = 1.96 kJ/0.0155 moles = 126.5 kJ/mol

Ans: Formation enthalpy = 126.5 kJ/mol

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