Skip to main content
Ch.3 - Molecules, Compounds & Chemical Equations
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 4th EditionCh.3 - Molecules, Compounds & Chemical EquationsProblema 64c
Capitolo 3, Problema 64c

Determine the number of moles (of molecules or formula units) in each sample. c. 0.1187 g C8H18

Guida verificata passo dopo passo
1
Identify the molecular formula of the compound, which is \( C_8H_{18} \).
Calculate the molar mass of \( C_8H_{18} \) by adding the atomic masses of all the atoms in the formula. Carbon (C) has an atomic mass of approximately 12.01 g/mol, and hydrogen (H) has an atomic mass of approximately 1.01 g/mol.
Multiply the number of each type of atom by its atomic mass and sum these values to find the molar mass of \( C_8H_{18} \).
Use the formula: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \) to calculate the number of moles of \( C_8H_{18} \) in the sample.
Substitute the given mass (0.1187 g) and the calculated molar mass into the formula to find the number of moles.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For example, to find the molar mass of octane (C8H18), you would multiply the number of carbon atoms by the atomic mass of carbon and the number of hydrogen atoms by the atomic mass of hydrogen, then add these values together.
Video consigliato:
Percorso guidato
02:11
Molar Mass Concept

Moles

A mole is a unit in chemistry that represents 6.022 x 10^23 entities, such as atoms, molecules, or formula units. This number, known as Avogadro's number, allows chemists to count particles by weighing them. The concept of moles is fundamental for converting between mass and the number of particles in a sample, facilitating stoichiometric calculations in chemical reactions.
Video consigliato:
Percorso guidato
01:25
Mole Concept

Conversion from Mass to Moles

To determine the number of moles from a given mass of a substance, you can use the formula: moles = mass (g) / molar mass (g/mol). This calculation allows you to convert the mass of a sample into the number of moles, which is essential for understanding the quantity of reactants or products in chemical reactions. In the case of 0.1187 g of C8H18, you would first calculate its molar mass and then apply this formula.
Video consigliato:
Percorso guidato
02:28
Mass and Moles Conversion
Pratica correlata
Domanda del libro di testo

How many molecules are in each sample? a. 6.5 g H2O c. 22.1 g O2 d. 19.3 g C8H10

585
views
Domanda del libro di testo

Determine the number of moles (of molecules or formula units) in each sample. a. 55.98 g CF2Cl2

895
views
Domanda del libro di testo

Determine the number of moles (of molecules or formula units) in each sample. a. 25.5 g NO2 b. 1.25 kg CO2 c. 38.2 g KNO3 d. 155.2 kg Na2SO4

Domanda del libro di testo

Determine the number of moles (of molecules or formula units) in each sample. d. 195 kg CaO

1732
views
Domanda del libro di testo

Determine the number of moles (of molecules or formula units) in each sample. b. 23.6 kg Fe(NO3)2

478
views
Domanda del libro di testo

How many molecules (or formula units) are in each sample? a. 85.26 g CCl4 b. 55.93 kg NaHCO3 c. 119.78 g C4H10 d. 4.59×105 g Na3PO4

1211
views