Calculate the formula mass for each compound. a. MgBr 2 b. HNO 2 c. CBr 4 d. Ca(NO 3 ) 2

Hey everyone in this example we need to determine the formula mass for strong T. M. I died. We want to recall that the formula mass is another way of saying the atomic mass. And so we can go ahead and calculate this by recalling that we have just one atom of strontium here in our compound. So we have strontium equal to its formula mass of one times the atomic mass according to our periodic table. For strontium is equal to 87. Am use. And so this gives us a value of 87.62. Next we look at our I died here or I'd I'm sorry and we see that we have two atoms of iodine. So we have two times its atomic mass from the periodic table equal to 26.9 A. M. Us. And so This multiplying this by two, Gives us a total of 2 53.8 am use. And so we would add our two totals from our all of our ions in our strontium iodide. And this gives us a value equal to 3:41.42 AM us as our formula mass of our strontium iodide. And so this would be our final answer. To complete 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 60a,b,c,d

Chapter 3, Problem 60a,b,c,d

Calculate the formula mass for each compound. a. MgBr₂ b. HNO₂ c. CBr₄ d. Ca(NO₃)₂

Verified step by step guidance

Step 1: Identify the atomic masses of the elements in the compound. The atomic mass of Magnesium (Mg) is approximately 24.305 g/mol and the atomic mass of Bromine (Br) is approximately 79.904 g/mol.

Step 2: Determine the number of each type of atom in the compound. In MgBr2, there is one atom of Magnesium and two atoms of Bromine.

Step 3: Multiply the atomic mass of each element by the number of atoms of that element in the compound. For Magnesium, this would be 24.305 g/mol * 1 = 24.305 g/mol. For Bromine, this would be 79.904 g/mol * 2 = 159.808 g/mol.

Step 4: Add up the results from step 3 to find the formula mass of the compound. The formula mass of MgBr2 would be the sum of the mass of Magnesium and the mass of Bromine, which is 24.305 g/mol + 159.808 g/mol.

Step 5: The formula mass of MgBr2 is the result from step 4. This is the final answer.

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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 magnesium bromide (MgBr2), the molar mass is determined by adding the atomic mass of magnesium (24.31 g/mol) to twice the atomic mass of bromine (79.90 g/mol).

Periodic Table

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number. Each element's atomic mass is listed, which is essential for calculating molar mass. Understanding the periodic table allows students to quickly find the necessary atomic masses for elements like magnesium and bromine when determining the formula mass of compounds.

Chemical Formula

A chemical formula represents the composition of a compound, indicating the types and numbers of atoms present. In the case of MgBr2, the formula indicates one magnesium atom and two bromine atoms. This information is crucial for calculating the formula mass, as it dictates how many times to include each element's atomic mass in the total calculation.