Stoichiometry Exercises - University of Waterloo
Stoichiometry Exercises François Gauvin, Université de Saint‐Boniface Page 2 of 2 6 (Question from me) A 32 5 mL sample of H3PO4 solution of unknown concentration is neutralized with 25 5 mL of 0 150 mol/L NaOH solution What is the initial concentration of the H3PO4 solution? 7
Lecture 5 - Metallurgist & Mineral Processing Engineer
Exercises on stoichiometry Contents Exercise i Exercise ii Do yourself Exercise iii Exercise iV Exercise V Exercise Vi Do yourself Exercise Vii Exercise‐ i A pyritic ore is reduced with hydrogen according to the following reaction: FeS 6 2H 6 Fe E2 H 6 S 15 FeS 6 100 kg ore 85 kg FeS 6 15 kg FeS 6 reacted L85 F4 25
Stoichiometry Calculation Practice Worksheet
Stoichiometry Calculation Practice Worksheet 1 Calculate the number of moles of NaOH that are needed to react with 500 0 g of H 2 SO 4 according to the following equation: H 2 SO 4 + 2 NaOH Na 2 SO 4 + 2 H 2 O ANS: 10 19 mol 2 Calculate the mass of NH 3 that can be produced from the reaction of 125 g of NCl 3 according to the following equation:
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2O Then do some stoichiometry using “easy math” 16 g of methane (MM = 16) is 1 mole and 1 mole of methane will produce 1 mole of CO 2 = 44 g, and 2 moles of H 2O which is 36 g for a total of 80 g 4 d Balance: C 3H 8 + 5O 2 → 3CO 2 + 4H 2O 5 d Balance: 2KClO 3 → 2KCl + 3O 2
CHM 130 Stoichiometry Worksheet - Welcome to webgccazedu
CHM 130 Stoichiometry Worksheet The following flow chart may help you work stoichiometry problems Remember to pay careful attention to what you are given, and what you are trying to find 1 Fermentation is a complex chemical process of making wine by converting glucose into ethanol and carbon dioxide: C 6 H 12 O 6 (s) 2 C 2 H 5 OH (l) + 2 CO
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Mass–Mass Stoichiometry Prerequisite Skills for Stoichiometry Write chemical formulas Ch 6 Calculate molar masses from chemical formulas Sect 7 4 Use molar masses to convert between moles and mass Sect 7 5 Write and balance chemical equations Ch 8 Use an equation to convert from moles
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Stoichiometry is the tool for answering these questions Stoichiometry The study of quantitative relationships between the amounts of reactants used and amounts of products formed by a chemi-cal reaction is called stoichiometry Stoichiometry is based on the law of conservation of mass Recall from Chapter 3 that the law states that
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CHM 130 Stoichiometry Worksheet
The following flow chart may help you work stoichiometry problems. Remember to pay careful attention to what you are given, and what you are trying to find.1. Fermentation is a complex chemical process of making wine by converting glucose into ethanol and
carbon dioxide:C6H12O6(s) J 2 C2H5OH (l) + 2 CO2(g)
A. Calculate the mass of ethanol produced if 500.0 grams of glucose reacts completely. B. Calculate the volume of carbon dioxide gas produced at STP if 100.0 grams of glucose reacts. C. If 17.5 moles of ethanol were produced, how many moles of glucose were there in the beginning?2. Consider the reaction of zinc metal with hydrochloric acid, HCl(aq).
A. Write the equation for this reaction, then balance the equation. B. Calculate the moles of HCl needed to react completely with 8.25 moles of zinc. C. Calculate the grams of zinc chloride produced if 0.238 grams of zinc react completely. D. Calculate the volume of hydrogen gas produced at STP if 25.0 grams of HCl react completely.3. If you dissolve lead(II) nitrate and potassium iodide in water they will react to form lead(II) iodide and
potassium nitrate. A. Write the equation for this reaction, then balance the equation. B. Calculate the grams of lead(II) iodide that can be produced from 5.00 moles of potassium iodide.C. Calculate the grams of lead(II) iodide that can be produced from 75.00 grams of potassium iodide.
4. Write then balance the combustion reaction for propane gas, C3H8.
A. If 5.00 grams of propane burn completely, what volume of carbon dioxide is produced at STP? B. If 75.0 L of steam are produced at STP, what mass of propane must have burned? C. If 34.2 grams of propane are completely combusted, how many moles of steam will that produce?CHM 130 Stoichiometry Worksheet KEY
1. Fermentation is a complex chemical process of making wine by converting glucose into ethanol and
carbon dioxide:C6H12O6(s) J 2 C2H5OH (l) + 2 CO2(g)
A. Calculate the mass of ethanol produced if 500.0 grams of glucose reacts completely.500.0 g C6H12O6
OHHC mol 1
OHHC g 08.46
OHC mol 1
OHHC mol 2
OHC g 18.180
OHC mol 1
5252
6126
52
6126
6126
= 255.7 g C2H5OH B. Calculate the volume of carbon dioxide gas produced at STP if 100.0 grams of glucose reacts.
100.0 g C6H12O6
2 2 61262 6126
6126
CO mol 1
CO L 22.4
OHC mol 1
CO mol 2
OHC g 18.180
OHC mol 1
= 24.9 L CO2 C. If 17.5 moles of ethanol were produced, how many moles of glucose were there in the beginning?17.5 mol C2H5OH
OHHC mol 2
OHC mol 1
526126
= 8.75 mol C6H12O6
2. Consider the reaction of zinc metal with hydrochloric acid, HCl(aq).
A. Write the equation for this reaction, then balance the equation.Zn(s) + 2 HCl(aq) J H2(g) + ZnCl2(aq)
B. Calculate the moles of HCl needed to react completely with 8.25 moles of zinc.8.25 mol Zn
Znmol 1
HCl mol 2
= 16.5 mol HCl C. Calculate the grams of zinc chloride produced if 0.238 grams of zinc react completely.0.238 g Zn
2 22ZnClmol 1
ZnClg 136.29
Znmol 1
ZnClmol 1
Zng 5.396
Zn mol 1
= 0.496 g ZnCl2 D. Calculate the volume of hydrogen gas produced at STP if 25.0 grams of HCl react completely.25.0 g HCl
2 22H mol 1
H L 22.4
HCl mol 2
H mol 1
HCl g 36.46
HCl mol 1
= 7.68 L H2 gas3. If you dissolve lead(II) nitrate and potassium iodide in water they will react to form lead(II) iodide and
potassium nitrate. A. Write the equation for this reaction, then balance the equation. Pb(NO3)2(aq) + 2 KI(aq) J PbI2(s) + 2 KNO3(aq) B. Calculate the grams of lead(II) iodide that can be produced from 5.00 moles of potassium iodide.5.00 mol KI
2 22PbI mol 1
PbI g 461.0
KI mol 2
PbI mol 1
= 1.15 x 103 g PbI2C. Calculate the grams of lead(II) iodide that can be produced from 75.00 grams of potassium iodide.
75.00 g KI
2 22PbI mol 1
PbI g 461.0
KI mol 2
PbI mol 1
KI g 166.00
KI mol 1
= 104.1 g PbI24. Write then balance the combustion reaction for propane gas, C3H8.
C3H8(g) + 5 O2(g) J 3 CO2(g) + 4 H2O(g) A. If 5.00 grams of propane burn completely, what volume of carbon dioxide is produced at STP?5.00 g C3H8
2 2 832 83
83
CO mol 1
CO L 22.4
HC mol 1
CO mol 3
HC g 44.11
HC mol 1
= 7.62 L CO2 B. If 75.0 L of steam are produced at STP, what mass of propane must have burned?75.0 L H2O
8383
2 83
2 2
HC mol 1
HC g 44.11
OH mol 4
HC mol 1
OH L 22.4
OH mol 1
= 36.9 g C3H8 C. If 34.2 grams of propane are completely combusted, how many moles of steam will that produce?34.2 g C3H8
832 83
83