Calculate the formula mass for each compound. a. NO 2 c. C 6 H 12 O 6 b. C 4 H 10 d. Cr(NO 3 ) 3

Hey everyone in this example, we need to determine the formula mass of Anthony like acid. We want to recall that formula mass is interchangeable with the term atomic mass. So we're going to go ahead and calculate based on each amount of atoms we have in this compound, our formula mass. So for carbon we want to recognize that we have that subscript of seven and so we have seven times Or seven atoms times its atomic mass according to our periodic table equal to 12.01 am use. This gives us a value equal to 84.07 AM. You next? We have our hydrogen atom which we see we have seven atoms of as well which we can multiply by hydrogen atomic masses on the periodic table of 1.8 AM use And this is going to give us 7.056 am use. Then we have our nitrogen atom which we only have one of because we don't have any subscript next to it. So we would say one times its atomic mass according to the periodic table of 14.1 A. M. U. S. Which gives us the same thing 14.01 a. m. use. And lastly we have our oxygen in which we have two atoms of so we take two times its atomic mass according to the periodic table of 16 AM Use. And that gives us a total of 32 a. m. use. And so we're going to take the total of all of the contributions of atomic mass units from each of these atoms. And this is going to give us a total of 137.14 am use as our formula mass of our Anthony Illich assets. So C seven H seven N 02. So this is our final answer for this example, if you have any questions, please leave them down below and I will see everyone in the next practice video.

Ch.3 - Molecules, Compounds & Chemical Equations

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Tro 4th Edition

Ch.3 - Molecules, Compounds & Chemical Equations

Problem 59a,b,c,d

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Chapter 3, Problem 59a,b,c,d

Calculate the formula mass for each compound. a. NO₂ c. C₆H₁₂O₆ b. C₄H₁₀ d. Cr(NO₃)₃

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Identify the number of each type of atom in the molecular formula C6H12O6. This compound contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Find the atomic mass of each type of atom from the periodic table. Typically, the atomic mass of Carbon (C) is approximately 12.01 amu, Hydrogen (H) is about 1.008 amu, and Oxygen (O) is around 16.00 amu.

Multiply the atomic mass of each atom by the number of atoms of that element in the molecule. For Carbon: 12.01 amu \(\times\) 6, for Hydrogen: 1.008 amu \(\times\) 12, and for Oxygen: 16.00 amu \(\times\) 6.

Add the total masses of each element together to find the total formula mass of the compound. Sum the products from the previous step.

The result from the previous step gives you the formula mass of C6H12O6 in atomic mass units (amu).

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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). It is calculated by summing the atomic masses of all the atoms in a chemical formula. For example, in glucose (C6H12O6), the molar mass is determined by adding the masses of 6 carbon (C), 12 hydrogen (H), and 6 oxygen (O) atoms.

Atomic Mass

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). Each element has a specific atomic mass listed on the periodic table, which is used to calculate the molar mass of compounds. For instance, carbon has an atomic mass of approximately 12.01 amu, hydrogen about 1.01 amu, and oxygen around 16.00 amu.

Chemical Formula

A chemical formula represents the composition of a compound, indicating the types and numbers of atoms present. In the case of glucose (C6H12O6), the formula shows that it contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. Understanding the chemical formula is essential for calculating the formula mass, as it directly informs the quantities of each element involved.