# Stoichiometry Lab Reportnew Essay

Include any of the steps in which you may have lost sample or lost confidence in your technique - Stoichiometry Lab Reportnew Essay introduction. Write the complete balanced equation. Use subscripts correctly by using the tool bar or you will lose a point. (2 points) Calculations: (1 0 points) for all calculations show your work using a table to demonstrate the unit factor method for full credit. Include the correct significant figures from your data. #1 has an example for you. Record all answers in the table below. 1 . Calculate the number of moles Of Cacao;EH from the mass you weighed out and record in the table below.

Have Factor (molar mass) Want g acacia;EH moles Cacao;EH Note: Cacao;EH is an example of a hydrate, the 2 water molecules are attached to the crystal structure of the compound. When determining the molar mass, add the mass of 2 water molecules to the mass of the Cacao. 2. From the balanced equation calculate the number of moles of Niacin required to react completely with the Cacao;EH and record in the table. (See lab, page 79 for example) Prepare a table. 3. Calculate the number of grams of Niacin to weigh out from the number of moles in step 2. Prepare a table. Calculate the number of grams of Cacao that are expected to be produced. This is your theoretical yield. Factor (molecular mass) Factor (mole ratio) g of Cacao;EH 1 mole acacia;EH mole Cacao g Cacao g Caches mole acacia;EH 1 mole cacao Fill in the data table. (3 points) Compound mass (g) (+/- 0. 1 g) # of moles Cacao;EH mass used Niacin mass used mass Of filter paper Mass of filter paper and Cacao Mass of Cacao 1 . Calculate the % yield from the number of grams of Cacao that are actually produced. Don’t forget to show your work. Conclusions: (3 points)

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