Download
1 / 18
180 likes | 303 Vues
This article explains how to derive the ratio of atoms in compounds using sodium carbonate (Na2CO3) as an example. It illustrates the concept of moles and the molar mass, which allows for conversions in chemical calculations. The total molar mass of Na2CO3 is calculated to be 105.9883 g. The text also explores potassium oxide (K2O), detailing its molar mass as 94.1960 g. This resource aids in understanding how to convert between grams and moles, enhancing calculations in chemistry.
E N D
A properly written compound shows the ratio of atoms in the compound. For example, sodium carbonate (Na2CO3) shows that for every 1 compound there are 2 atoms of Na, 1 atom of C, and 3 atoms of O.
This also works with the mole. For 1 mole of the compound, there are 2 moles of Na, 1 mole of C, and 3 moles of O. This information allows us to calculate the molar mass of the entire compound, often called the formula mass.
Once it is known that 1 mol of Na2CO3 = 105.9883 g, conversion factors can be made of this information: These conversion factors can then be used in other calculations.
What is the molar mass for potassium oxide (K2O)? K2O = 78.1966 g + 15.9994 g = 94.1960 g
