easechemistry

Points to Recall Mole is a basic physical quantity for measuring quantity of a substance in chemistry. There is no physical balance or device to measure moles of a substance directly . Firstly we take mass( grams) by physical balance then we convert this mass into moles. Molar Mass is calculated simply by  multiplying relative masses - which are obtained from periodic table- to Molar mass constant -which is 1g/mol. Like Relative atomic of potassium (K) = 39.01 a.m.u Molar Mass of K =39.01 x 1g/mol= 39.01g/mol Conversion Factor | Definition| "Conversion factor is a ratio - this ratio is always equal to 1 - used to covert one unit into other unit. Units are inter-converted simply by multiplying or dividing the suitable conversion factor". For Mole-Mass conversions the prior information to make conversions factors is: 1 mol.= Molar Mass(g) So, the two conversion factor will be (i) mol/g  (ii) g/ mol Note: select the conversion factor in such a way that same units cut each oth...