13Examples Balance the coefficients from reactants to products. __N2(g) __H2(g) __ NH3(g)B. __Co2O3(s) + __ C(s) __Co(s) + __CO2(g)Write a balanced equation for the reaction between carbon dioxide and potassium hydroxide to form potassium carbonate and water.
23ExamplesHow many sandwiches can be made from 10 slices of bread and 8 slices of cheese? Which one is the limiting reactant?The balanced chemical equation is2Bd + Ch Bd2Ch
24Example Ammonia, NH3, can be synthesized by the following reaction: 2 NO(g) H2(g) 2 NH3(g) H2O(g)Starting with 86.3 g NO and 25.6 g H2Determine the limiting reactantFind the theoretical yield of NH3 in grams
27Steps in determine the Empirical formula Step 1: Obtain the mass of each element (in grams)Step 2: Determine the numbers of atom presentStep 3: Divide the smallest moles by numbers of each atoms to obtain the closet integer as possible.Step 4: If the result ended with 0.5, 0.33, 1.125, 1.50 etc… then multiply with a factor to get the nearest integer as possible.
28ExampleA compound containing nitrogen and oxygen is decomposed in the laboratory and produces 24.5 g nitrogen and 70.0 g oxygen. Calculate the empirical formula of the compound.
29ExampleAn unknown sample gives the following mass percent: 17.5% Na, 39.7% Cr and 42.8% O. What is the empirical formula?
30ExampleButanedione – a main component in the smell and taste of butter and cheese – contains the elements carbon, hydrogen, and oxygen. The empirical formula of butanedione is C2H3O and its molar mass is g/mol. Find its molecular formula
31ExamplesIbuprofen, an aspirin substitute, has the following mass percent composition: C 75.69%, H 8.80% an O 15.51%. What is the empirical formula of ibuprofen?