LAB 8 Pre-Lab Questions portions of lab adapted from various online and reference sources 1. Fill in the missing parts of this chemical equation. Remember that a chemical with a dot in the middle is called a hydrate. The arrow means that heat will be applied, which will drive off the water from the hydrate. No physical states needed, but your final answer should be balanced. CuSO4.5H₂O -> CUSO4 + 2. Calculate the molar mass of the hydrate ZnSO4.7H₂O.

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Chapter4: Stoichiometry
Section: Chapter Questions
Problem 4.68PAE: 4.68 The pictures below show a molecular-scale view of a chemical reaction between the compounds AB2...
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LAB 8 Pre-Lab Questions
portions of lab adapted from various online and reference sources
1. Fill in the missing parts of this chemical equation. Remember that a chemical with a dot in the middle is called a
hydrate. The arrow means that heat will be applied, which will drive off the water from the hydrate. No physical states
needed, but your final answer should be balanced.
CuSO4.5H2O -> CUSO4 +
2. Calculate the molar mass of the hydrate ZnSO4.7H₂O.
3. A student took 4.92 g of hydrated magnesium sulfate crystals (MgSO4 xH₂O), but didn't write down how many water
molecules were attached, hence "x."
a. Write a balanced chemical equation that shows a decomposition of this molecule if we were to apply heat. No physical
states needed, but your final answer should be balanced (you can use x in balancing).
b. The student heated the hydrate. Once heating was complete, the dish had 2.40 g of dried magnesium sulfate. How
much water in grams did the student drive off from heating? Show work.
c. Convert your answer in (b) to moles of water. Show work.
d. Convert 2.40 g of MgSO4 to moles of MgSO4. Show work.
e. Pick the smallest number you got between answers (c) and (d). Divide both answers (c) and (d) by the smallest (jus
like we did with empirical formula problems). Show work.
Transcribed Image Text:LAB 8 Pre-Lab Questions portions of lab adapted from various online and reference sources 1. Fill in the missing parts of this chemical equation. Remember that a chemical with a dot in the middle is called a hydrate. The arrow means that heat will be applied, which will drive off the water from the hydrate. No physical states needed, but your final answer should be balanced. CuSO4.5H2O -> CUSO4 + 2. Calculate the molar mass of the hydrate ZnSO4.7H₂O. 3. A student took 4.92 g of hydrated magnesium sulfate crystals (MgSO4 xH₂O), but didn't write down how many water molecules were attached, hence "x." a. Write a balanced chemical equation that shows a decomposition of this molecule if we were to apply heat. No physical states needed, but your final answer should be balanced (you can use x in balancing). b. The student heated the hydrate. Once heating was complete, the dish had 2.40 g of dried magnesium sulfate. How much water in grams did the student drive off from heating? Show work. c. Convert your answer in (b) to moles of water. Show work. d. Convert 2.40 g of MgSO4 to moles of MgSO4. Show work. e. Pick the smallest number you got between answers (c) and (d). Divide both answers (c) and (d) by the smallest (jus like we did with empirical formula problems). Show work.
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