Massing The Moles Of Chocolate

ChemistryWiki | RecentChanges | Preferences

Difference (from prior major revision) (no other diffs)

Changed: 8c8
Group 1 - 0.00450 moles    Group 6 - 0.00575 moles    Group 11 - 0.00700 moles

Group 1 - 0.0100 moles    Group 6 - 0.0130 moles    Group 11 - 0.0143 moles


Changed: 10c10
Group 2 - 0.00475 moles    Group 7 - 0.00600 moles    Group 12 - 0.00725 moles

Group 2 - 0.0115 moles    Group 7 - 0.0133 moles    Group 12 - 0.0145 moles


Changed: 12c12
Group 3 - 0.00500 moles    Group 8 - 0.00625 moles    Group 13 - 0.00750 moles

Group 3 - 0.0120 moles    Group 8 - 0.0135 moles    Group 13 - 0.0147 moles


Changed: 14c14
Group 4 - 0.00525 moles    Group 9 - 0.00650 moles    Group 14 - 0.00775 moles

Group 4 - 0.0125 moles    Group 9 - 0.0137 moles    Group 14 - 0.0150 moles


Changed: 16c16
Group 5 - 0.00550 moles    Group 10 - 0.00675 moles    Group 15 - 0.00800 moles

Group 5 - 0.0127 moles    Group 10 - 0.0140 moles    Group 15 - 0.0153 moles



Massing the Moles of Chocolate Lab


During the holiday time, chocolate is a favorite treat of children (young and old). Chocolate is not a single substance but accurately a mixture where the main ingredient is cocoa. They believe cocoa is made up of thembroma oil, which they believe the chemical formula of this oil is C64H128O2. So I want you to mass out some chocolate.
How much you mass out depends on the number of moles of "chocolate" you are investigating. All groups will be assuming chocolate = all thembroma oil. So you will use the oil's chemical formula to determine the molar mass of the chocolate and thereby the mass you need to "weigh out" to obtain your group's desired moles.

Group 1 - 0.0100 moles    Group 6 - 0.0130 moles    Group 11 - 0.0143 moles

Group 2 - 0.0115 moles    Group 7 - 0.0133 moles    Group 12 - 0.0145 moles

Group 3 - 0.0120 moles    Group 8 - 0.0135 moles    Group 13 - 0.0147 moles

Group 4 - 0.0125 moles    Group 9 - 0.0137 moles    Group 14 - 0.0150 moles

Group 5 - 0.0127 moles    Group 10 - 0.0140 moles    Group 15 - 0.0153 moles


Directions

1) Using the space on the next page (or on a separate sheet of paper with info written on it), determine the mass you need for your Group's desire moles.

2) After checking your answer with the teacher, obtain a Zip lock bag.

3)Place Zip lock bag on scale and "zero" it out. Then add in calculated mass of chocolate into your bag (please make sure you are wearing gloves).

4) Bring bag with chocolate in it up to teacher's desk.
5) After teacher checks your mass, you can eat chocolate (or give it away).





Massing the Moles of Chocolate Lab


Name of Student:

Period:

Group # : ______     Desire Moles __________moles     Calculated mass _______g

Molar Mass of "Chocolate (remember g/mole): ______________________

Show work (as stated in notes and class below. Must be handwritten)















Questions/problems:

1. If you forgot to "zero out" the balance after you put the plastic bag on the scale and then weighed out "your calculated mass of chocolate". Would you have MORE, LESS or SAME moles of chocolate than you should have? Give a brief explanation of why?






Chocolate is not all thermobroma oil. So if it was known that the molar mass of chocolate was actually greater than the molar mass of thermobroma oil and you recalculated the mass of chocolate to get the same moles, would you mass be GREATER, SMALLER or the SAME ? Give a brief explanation of why?








ChemistryWiki | RecentChanges | Preferences
Edit text of this page | View other revisions
Last edited December 3, 2020 8:05 pm (diff)
Search: