Ch.3 - Chemical Reactions and Reaction Stoichiometry

Problem 5c

Chapter 3, Problem 5c

Glycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. (c) Calculate how many moles of glycine are in a 100.0-g sample of glycine.

Verified step by step guidance

Determine the molar mass of glycine by adding the atomic masses of each element in the molecular formula of glycine, C2H5NO2. Use the periodic table for accurate atomic masses.

Convert the mass of glycine from grams to moles using the formula: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \).

Substitute the given mass of glycine (100.0 g) into the formula.

Perform the division to calculate the number of moles of glycine.

Ensure the units are correct, the final answer should be in moles.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For glycine, the molar mass can be calculated by summing the atomic masses of its constituent elements: carbon, hydrogen, nitrogen, and oxygen. This value is essential for converting between grams and moles in stoichiometric calculations.

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10²³ entities, such as atoms or molecules. Understanding the mole concept allows chemists to relate mass to the number of particles, facilitating calculations involving chemical reactions and compositions.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It involves using balanced chemical equations to calculate the amounts of substances consumed and produced. In this context, stoichiometry helps determine how many moles of glycine are present in a given mass, which is crucial for understanding its role in biological processes.

Recommended video:

Guided course

01:16

Stoichiometry Concept

Related Practice

Textbook Question

The following diagram represents the collection of elements formed by a decomposition reaction. (a) If the blue spheres represent N atoms and the red ones represent O atoms, what was the empirical formula of the original compound?

views

Textbook Question

The following diagram represents the collection of CO2 and H2O molecules formed by complete combustion of a hydrocarbon. What is the empirical formula of the hydrocarbon?

views

Textbook Question

Glycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. (a) Write its molecular formula.

views

Textbook Question

Glycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. (d) Calculate the percent nitrogen by mass in glycine.

views

Textbook Question

The following diagram represents a high-temperature reaction between CH4 and H2O. Based on this reaction, find how many moles of each product can be obtained starting with 4.0 mol CH4.

Based on this reaction, find how many moles of CO can be obtained starting with 4.0 mol CH4?

views

Textbook Question

The following diagram represents a high-temperature reaction between CH4 and H2O. Based on this reaction, find how many moles of each product can be obtained starting with 4.0 mol CH4. Based on this reaction, how many moles of H2 can be obtained starting with 4.0 mol CH4?

views