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Chem Conservation Of Mass Lab

Content type
User Generated
Subject
Chemistry
Type
Homework
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1) If you had not dried the solid, would the calculated percent yield have been higher,
lower, or unchanged? Explain
If the solid was not properly dried, the measured (recorded) mass would be higher than
the true experimental mass. This would introduce an error which will make the percent
yield higher than what should be calculated. Recall that % yield is calculated as follows:




Higher mass, higher yield.
2)Boron trichloride is prepared from the following reaction. 2B2O3 + 6Cl2 + 3C --> 4BCl3
+ 3CO2 . If 3.456g of B2O3 is mixed with 9.9216g of Cl2 and 2.459g of C then answer
the following questions.
2a) What is the theoretical yield of boron trichloride in grams?
2B
2
O
3
+ 6Cl
2
+ 3C --> 4BCl
3
+ 3CO
2
Find the limiting reagent: (MM BCl
3
= 117.16 g/mol)
If B
2
O
3
is the LR (MM = 69.62 g/mol)









If Cl
2
is the LR (MM = 70.90 g /mol)









If C is the LR (MM = 12.01 g/mol)









Therefore, the limiting reagent is Cl
2
and the theoretical mass of BCl
3
is 10.930
g.

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1) If you had not dried the solid, would the calculated percent yield have been higher, lower, or unchanged? Explain If the solid was not properly dried, the measured (recorded) mass would be higher than the true experimental mass. This would introduce an error which will make the percent yield higher than what should be calculated. Recall that % yield is calculated as follows: % 𝑌𝑖𝑒𝑙𝑑 = 𝑟𝑒𝑐𝑜𝑟𝑑𝑒𝑑 𝑚𝑎𝑠𝑠 ∗ 100 𝑡ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑚𝑎𝑠𝑠 Higher mass, higher yield. 2)Boron trichloride is prepared from the foll ...
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