These molar mass worksheets provide students with a reminder of Avogadro’s constant and how to calculate the number of moles, the mass or the Mr of a chemical compound using the mole formula triangle. The worksheets are differentiated by level of scaffolding; higher ability students must calculate the relative formula mass of each compound using the periodic table whereas these are given on ...

A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction. The numbers in a conversion factor come from the coefficients of the balanced chemical equation. The following six mole ratios can be written for the ammonia forming reaction above. Answer: look at the units, grams should cancel in the calculation, leaving an answer that has units of moles. This is illustrated below. • To convert volume to moles, first convert to mass using density, then convert to moles using molecular weight. Again, be sure to include all units in your calculations. It will help you to avoid errors ... whole-number ratios based on the number of moles of each element per 100 grams of compound. Calculate Step 2. Solve for the unknown. One hundred grams of compound has 5.9 g H and 94.1 g O. Multiply by conversion factors relating moles of the elements to grams: So, the mole ratio for 100 g of the compound is H 5.9 O 5.9. But formulas must have whole

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