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shared via CourseHero com This study resource was https www coursehero com file 31841599 MoleConversion Mole Conversions and Chemical Formula of a Hydrate Determination Lab Report Assistant Introduction Since single atoms and single molecules are so tiny chemists gave them a name to represent the smallest quantities of substances a mole A mole is a unit of measure to describe the amount of a substance to represent how many atoms or molecules This is referred to as Avogadro s number 6 02x1023 in congruence molar masses consists of the atomic mass units The two terms are equivalent Next hydrate compounds are consisted of water molecules with a crystalline structure When they are heated the water is released from the sample Materials Aluminum pie pan Matches Cotton ball Aluminum crystals Aluminum cups 2 oz Burner fuel Burner stand Digital scale Glass stirring rod Pair of gloves Safety goggles Test tube clamp Procedure Include Pictures Exercise 1 Using Mass to Calculate Moles and Atoms 1 Gather the digital scale aluminum cup glass stirring rod and cotton ball 2 Using the periodic table identify the molar mass of aluminum Al shared via CourseHero com This study resource was https www coursehero com file 31841599 MoleConversion 3 Record the molar mass of Al in the data table 4 Turn on digital scale and make sure it displays 0 00 g 5 Determine the mass of the aluminum cup by placing it on the scale Record on the data table 6 Calculate the follow and record in the data table a of moles of Al present in the Al cup b of atoms of Al present in the Al cup 7 Using the periodic table calculate the molar mass of SiO2 and record in the data table 8 Locate the glass stirring rod and place it on the scale Record the mass in the data table 9 Calculate each of the following and record findings in the data table a Number of moles of SiO2 present in the glass stirring rod b Number of moles on Si and O present in the glass stirring rod c Number of atoms of Si and O present in the glass stirring rod 10 Using the periodic table determine the molar mass of C6H10O5 and record in the data table 11 Repeat steps 8 9 for the cotton ball Exercise 2 Water of Hydration 1 Put on safety goggles and gloves 2 Turn on the digital scale so it reads 0 00 g 3 Calculate the mass of the aluminum cup by placing it on the scale Record in data table 4 Using the second aluminum cup as a weigh boat place it on the scale tare the scale and measure 2 00 g of aluminum crystals KAl SO4 2 5 Transfer the crystals to the first aluminum cup and place it on the scale to obtain the mass Record in data table 6 Assemble the burner setup and light the fuel a Gather the burner fuel aluminum plate burner stand 2oz aluminum cup and lighter or matches b Place aluminum plate on solid surface away from obstacles and flammable objects and place the burner stand towards the back c Use matches or lighter to ignite the fuel BE CAREFUL d Gently slide fuel under stand 7 Using the test tube clamp pick up the aluminum cup that contains the crystals and place it on the burner stand 8 Allow aluminum cup to heat on the burner for approximately 5 minutes or until all of the bubbling has subsided 9 After the aluminum cup cools use the test tube clamp to place it on the digital scale Record mass of cup in data table 10 Repeat steps 7 9 to complete 2nd heating using the SAME CUP OF ALUMINUM CRYSTALS 11 Disassemble the fuel burner using the other aluminum cup to extinguish the flame by placing it over the flame shared via CourseHero com This study resource was https www coursehero com file 31841599 MoleConversion 12 Calculate the mass of water released when the sample was heated by subtracting the mass of the 2nd heating from the mass of the aluminum cup aluminum crystals and record in the data table 13 Subtract the water mass from the original hydrate mass of 2 00g to obtain the mass of anhydrous 14 Calculate the molar mass of water and record in the data table 15 Calculate the moles of water released by heating the sample and record in the data table Data and Calculations Exercise 1 Using Mass to Calculate Moles to Atoms 1 ALUMINUM DATA Molar Mass of Aluminum from periodic table 26 982 Grams mole Mass of Aluminum Cup from the digital scale 2 4Grams Number of Moles of Aluminum present in the Aluminum cup Show work here using this formula grams molar mass 2 4g 26 982g mol 0 0889 Mole Number of Atoms of Aluminum present in the Aluminum Cup Show work here using this formula Moles x Avogadro s Number 0889 mol x 6 02x1023 5 35x1022Atoms 2 GLASS STIRRING ROD DATA Molar Mass of Silicon Dioxide from periodic table 59 998Grams mole Mass of Silicon Dioxide from the digital scale 4 8Grams Number of moles of Silicon Dioxide present in the glass stirring rod Show work here using this formula grams molar mass 4 8g 59 998g mol 0 08 Moles shared via CourseHero com This study resource was https www coursehero com file 31841599 MoleConversion Number of Moles of Silicon Same number as above because SiO2 has one mole of silicon in the molecular formula 0 08 Moles Number of Moles of Oxygen the number of moles of SiO2 times 2 because there are two moles of oxygen in the molecular formula 0 16 Moles Number of Atoms of Silicon Show work here using this formula Moles of silicon x Avogadro s Number 08mol x 6 02x1023 4 816x1022 SiliconAtoms Number of Atoms of Oxygen Show work here using this formula Moles of oxygen x Avogadro s Number 16 x 6 02x1023 9 632x1022 Oxygen Atoms Number of atoms of Si and O present in the glass stirring rod add together the answers above 1 445x1023 Atoms 3 COTTON BALL DATA Molar Mass of cellulose C6H10O5 from periodic table 162 11 Grams mole Mass of cotton ball from digital scale 0 6 Grams Number of moles of cellulose from a cotton ball Show work here using the formula Mass molar mass 6g 162 11g mol 0037 Moles Number of Moles of Carbon There are 6 moles of carbon in each mole of cellulose from the molecular formula C6H10O5 0 03 Moles Number of Moles of Hydrogen There are 10 moles of hydrogen in each mole of cellulose from the molecular formula C6H10O5 5 94 Moles Number of Moles of Oxygen There are 5 moles of oxygen in each mole of cellulose from the molecular formula C6H10O5 0 19 Moles Number of Carbon Atoms in cellulose Show work using this formula Moles of carbon x Avogadro s Number 1 806x1022 Atoms shared via CourseHero com This study resource was https www coursehero com file 31841599 MoleConversion 0 03 mol 6 02x1023 Number of Hydrogen Atoms …


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USM CHE 104L - Mole Conversions and Chemical Formula of a Hydrate Determination - Lab Report

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