Which of the following represents the least number of...

Which of the following represents the least number of molecules? (a) $20.0 \mathrm{g}$ of $\mathrm{H}_{2} \mathrm{O}(18.02 \mathrm{g} / \mathrm{mol})$ (b) $77.0 \mathrm{g}$ of $\mathrm{CH}_{4}(16.06 \mathrm{g} / \mathrm{mol})$ (c) $68.0 \mathrm{g}$ of $\mathrm{CaH}_{2}(42.09 \mathrm{g} / \mathrm{mol})$ (d) $100.0 \mathrm{g}$ of $\mathrm{N}_{2} \mathrm{O}(44.02 \mathrm{g} / \mathrm{mol})$ (e) 84.0 g of $\mathrm{HF}(20.01 \mathrm{g} / \mathrm{mol})$

Which of the following represents the least number of molecules?
(a) $20.0 \mathrm{g}$ of $\mathrm{H}_{2} \mathrm{O}(18.02 \mathrm{g} / \mathrm{mol})$
(b) $77.0 \mathrm{g}$ of $\mathrm{CH}_{4}(16.06 \mathrm{g} / \mathrm{mol})$
(c) $68.0 \mathrm{g}$ of $\mathrm{CaH}_{2}(42.09 \mathrm{g} / \mathrm{mol})$
(d) $100.0 \mathrm{g}$ of $\mathrm{N}_{2} \mathrm{O}(44.02 \mathrm{g} / \mathrm{mol})$
(e) 84.0 g of $\mathrm{HF}(20.01 \mathrm{g} / \mathrm{mol})$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the constant that defines the number of particles in one mole. It enables the translation of a substance's amount from moles to the actual count of molecules or atoms, facilitating comparisons between different samples.

Mass-to-Mole Conversion

Mass-to-mole conversion is a process that involves dividing the mass of a substance by its molar mass to calculate the number of moles present. This conversion is critical for comparing different substances on the basis of the number of particles they contain.

Mole Concept

The mole is a fundamental unit in chemistry used to express amounts of a chemical substance. It represents a specific number of particles, typically atoms or molecules, and forms the basis for relating measurable masses of substances to the number of constituent particles present.

Molar Mass

Molar mass is the mass of one mole of a substance, expressed in grams per mole. It provides a bridge between the mass of a sample and the number of moles it contains, making it essential for quantitative chemical calculations.

Transcript

Please give Ace some feedback