Stoichiometry & Mole Concept

Practice moles, Avogadro, and quantitative basics. Ideal for board exams and competitive test prep.

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QUESTION NO 01

Avogadro's number is approximately?

Answer: 6.022 × 10²³

One mole contains about 6.022 × 10²³ entities.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

pH of a neutral aqueous solution at 25 °C is?

Answer: 7

At 25 °C, [H⁺] = 1 × 10⁻⁷ M gives pH 7.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

The ideal gas equation is?

Answer: PV = nRT

Ideal gases obey PV = nRT.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Enthalpy change at constant pressure equals?

Answer: Heat exchanged (qp)

ΔH = qp for a constant-pressure process.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

A catalyst increases rate by?

Answer: Lowering activation energy

Catalysts provide a lower-Ea pathway; Keq is unchanged.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

First-order half-life is?

Answer: Independent of initial concentration

For first-order, t½ = ln2/k.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Osmotic pressure of a dilute solution is given by?

Answer: π = CRT

van't Hoff: π = CRT for dilute solutions.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Entropy of an isolated system in a spontaneous process?

Answer: Increases or stays the same

Second law: entropy of an isolated system does not decrease.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Raoult's law relates vapor pressure to?

Answer: Mole fraction of solvent/solute

pᵢ = xᵢ pᵢ° for ideal solutions.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

Buffer solutions resist changes in?

Answer: pH

Buffers contain a weak acid/base conjugate pair that stabilizes pH.

Shahzad Mahota @shahzad-mahota

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Stoichiometry & Mole Concept

Avogadro's number is approximately?

pH of a neutral aqueous solution at 25 °C is?

The ideal gas equation is?

Enthalpy change at constant pressure equals?

A catalyst increases rate by?

First-order half-life is?

Osmotic pressure of a dilute solution is given by?

Entropy of an isolated system in a spontaneous process?

Raoult's law relates vapor pressure to?

Buffer solutions resist changes in?

Published By

Shahzad Mahota

00

00

00

00

00

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Stoichiometry & Mole Concept

Avogadro's number is approximately?

Explanation

pH of a neutral aqueous solution at 25 °C is?

Explanation

The ideal gas equation is?

Explanation

Enthalpy change at constant pressure equals?

Explanation

A catalyst increases rate by?

Explanation

First-order half-life is?

Explanation

Osmotic pressure of a dilute solution is given by?

Explanation

Entropy of an isolated system in a spontaneous process?

Explanation

Raoult's law relates vapor pressure to?

Explanation

Buffer solutions resist changes in?

Explanation

Published By

Shahzad Mahota

00

00

00

00

00

00

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