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[Download the accompanying PDF worksheet.] 1. A bright orange, crystalline substance is analyzed and determined to have the following mass percentages: 17.5% Na, 39.7% Cr, and 42.8% O. Determine its empirical formula. 2. A sample of cisplatin is 65.02% platinum, … Read More
[Download the accompanying PDF worksheet.] Perform the following calculations, being sure to give the answer with the correct number of significant digits. How many atoms are in 8.21 g Li? What is the mass in grams of 4.17×1021 formula units … Read More
[Watch the Lesson on Molar Mass here.] [Download the accompanying PDF worksheet.] Solve the following problems: What is the mass in grams of 51.2 moles of trichlorine nonafluoride? What is the mass in grams of 3.00 moles of magnesium chlorite? How … Read More
[View the accompanying Practice Problems on Molar Mass Conversions here.] What is Molar Mass? Molar mass is literally the mass of one mole of a substance. We saw in a previous lesson on atomic mass that the periodic table provides us … Read More
[Download the accompanying PDF worksheet here.] Name the following ionic compounds, molecular compounds, and acids: Al2S3 H3PO3(aq) P2O5 Cu(OH)2 HClO4(aq) K2O (NH4)2CO3 HC2H3O2(aq) Ni(SO4)2
[Download the accompanying PDF worksheet here.] Determine the formulas of the following ionic compounds, molecular compounds, and acids: lead(II) chloride magnesium phosphate nitrogen triiodide hydrofluoric acid calcium nitride tin(IV) oxide dichlorine heptaoxide sodium hydrogen sulfate triantimony hexasulfide
[View the accompanying Lesson on Formulas for Ionic Compounds here.] There is a mistake on #2. Selenate ion is SeO42-, so aluminum selenate should be Al2(SeO4)3. [Download the accompanying PDF worksheet here.] Write formulas for the following ionic compounds: barium sulfide … Read More
[Download the PDF of Chemical Nomenclature Rules here.] What Are Polyatomic Ions? Unlike monoatomic ions, which are composed of a single atom, polyatomic ions are composed of many atoms. (The prefix poly- means “many,” as in polygon or polytheism.) There are some rules … Read More
[Miss part one? Check out Atomic Mass Calculations I.] [Download the accompanying PDF worksheet.] 1. Magnesium has three naturally occurring isotopes, 24Mg (78.99%, 23.9850 amu), 25Mg (10.00%, 24.9858 amu), and 26Mg. Determine the percent abundance and isotopic mass of 26Mg. … Read More
[Download the accompanying PDF worksheet.] Calculate the Average Atomic Mass Calculate the average atomic mass of an element with two naturally occurring isotopes: 85X (72.15%, 84.9118 amu) and 87X (27.85%, 86.9092 amu). What is this element? Chromium has the following … Read More
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