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UWGB Chemistry Determining the Theoretical Yield of Water Questions
User Generated
EbanxO
Science
University of Wisconsin Green Bay
Description
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3) You have 100.0 mL of a 2.5 M HCI solution. You added 11.5 grams of NaOH to the w
Total volume of the solution remains 100.0 mL
Determine moles of HCl initially (before the reaction)
b.
Determine moles of NaOH initially (before the reaction).
e
Write the balanced chemical equation for the reaction between HCl and NaOH,
including physical states.
d. Determine pH of the solution after the reaction is complete.
4) 2.00 grams of sodium hydroxide (NaOH) were placed in a 50.0 mL volumetric flask. Then water
was added to the line to make solution A. Then 10.00 mL of solution
A were placed in a 100.0
mL volumetric flask. Then water was added to the line to make solution B.
Determine moles in Solution A
a
b. Determine molarity of Solution A.
c. Determine molarity of Solution B.
5) A compound has the following mass percentages: carbon 40.68%, hydrogen 5.10%, and oxygen
54.20%. The mass of the molecular formula is between 255.00/mol to 315.00 /mol.
Determine the empirical and molecular formula.
EF:
MF
6) A reaction between hydrazine, N2H4, and dinitrogen tetroxide, N204, has been used to launch
rockets into space. The reaction produces nitrogen gas and water vapor, as shown in the
balanced equation.
2N2H4 (1) + N204 (1) 3N2 (g) + 4H20 (g)
If 20.0 grams of both reactants are reacted determine the following:
a) Determine theoretical yield of water (in grams).
b) Identify limiting and excess reagents.
c) Determine the amount of excess reagent leftover in grams.
7) A chemistry student produced calcium oxide in lab by heating up a solid sample of calcium in a
write down the initial amount of calcium that was used. The following data was collected by
crucible causing it to react with excess oxygen in the room. Unfortunately, the student did not
the student:
Mass of crucible
Mass of calcium
"Mass of crucible and calcium oxide solid produced
22.813
???
29.949 y
a) Write the balanced chemical equation that took place in this experiment. Include physical states,
b) Using the data provided, calculate the initial grams of calcium used in the reaction. (Assume the
student had 100% yield.)
c) If the student had only gotten 62.0% yield, which part of the data would change? Explain.
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