CHEM 101L Chapter Notes - Chapter 5.1: Chemical Formula, Silver Nitrate, Electronegativity
29 Oct 2016
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Chem 101: using mass percent to calculate percent yields and using mass. In order to get mass percent, we do a very easy calculation of: [mass of object you"re concerned about]/[total mass of the object that the substance you want to find is encompassed in]x100% So in terms of our example of body weight, we would have the following calculation: [60 lbs. of head]/[180 lbs. of total body weight]x 100% = 33. 33% head weight by mass. In stochiometric terms, we always express mass percent in terms over 100, so in other words we use the following expression for mass percent when dealing with stochiometric equations: Mass % of an element = [molar mass of concerned substance in compound* 1 mole of compound]/[molar mass of compound * 1 mole]*100% Now for example, let"s take the simple precipitation reaction of silver nitrate + hydrochloric acid: Agno3 (aq) + hcl (aq) hno3 (aq) + agcl (s)
