2. SAMPLE # 2 crucible, cover, unknown hydrate 18.1352g crucible and cover |5. \4० ४ sample 2.9944 first second third weighing weighing weighing crucible, cover, anhydrous salt 17.5246 7,5249 g H2O lost (use your last weighing) 17.5249g % water, experimental SHOW CALCULATION 93

2. SAMPLE # 2 crucible, cover, unknown hydrate 18.1352g crucible and cover |5. \4० ४ sample 2.9944 first second third weighing weighing weighing crucible, cover, anhydrous salt 17.5246 7,5249 g H2O lost (use your last weighing) 17.5249g % water, experimental SHOW CALCULATION 93

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

2. SAMPLE # 2
crucible, cover, unknown hydrate
18.1352g
crucible and cover
|5. \4० ४
sample
2.9944
first
second
third
weighing
weighing
weighing
crucible, cover,
anhydrous salt
17.5246
7,5249
g
H2O lost (use your last weighing)
17.5249g
% water, experimental
SHOW CALCULATION
93

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Subject: chemistry
PERCENT WATER IN A HYDRATE DATA/CALCULATION SHEET NAME 1. crucible, cover, BaCl2 2H2O \8,ao6! crucible and cover 14.0188 g BaCl, 2H2O 4.1873 first second third weighing weighing weighing crucible, cover, anhydrous BaCl, 7.5824 17.5815 H2O lost (use your last weighing) 7.58158 % water, experimental SHOW CALCULATION
PERCENT WATER IN A HYDRATE DATA/CALCULATION SHEET NAME 1.. crucible, cover, BaCl2 2H2O _\8, a0G! g crucible and cover 14.0188g BaCl 2H2O 4.1873 g first second third weighing weighing weighing crucible, cover, anhydrous BaCl, 7.5824 17.5815 H2O lost (use your last weighing) 17.58158 % water, experimental SHOW CALCULATION % water, theoretical (See prelab) % error SHOW CALCULATION
Record of your data Identity of metal Tin 1. Mass of metal, (g) 49.437 Trial 1 Trial 2 2. Mass of Styrofoam® cup and water, (g) 61.856 62.977 3..Mass of Styrofoam® cup, (g) 9.346 9.346 4. Mass of water, (g) ___________ ___________ 5. Initial temperature of metal (temp of boiling water) (o C) 99.5 99.5 6. Initial temperature of water in cup,(o C) 21.5 22.9 7. Final temperature of water and metal (o C) 25.9 26.5 8. Specific heat of metal, (cal/go C) ___________ ___________ 9. Average specific heat of metal, (cal/go C) ___________ Calculations: ΔTwater = Tf – Ti water = ____oC ΔTmetal = Tf – Ti metal = _ oC Qwater = (1.00 cal/go C) x ( g water) x ( oC) = cal Qmetal = – Qwater Cmetal = Qmetal / (mmetal x ∆Tmetal )= – _______cal / [(______g) x (_____oC)] = ________cal/goC
5. Generally, in order to do a stoichiometry problem, you need a complete balanced equation. However, in some cases it is possible to do some stoichiometric calculations without the complete equation as long as a particular element is present in only one reactant and one product. For example, if you were told that an experiment converted FeCl3 to Fe3O4 and that those were the only reactants and products that contained iron (Fe), you would know that there would have to be 3 moles of FeCl3 for every 1 mole of Fe;O4 or else the iron would not balance. You would not know for sure whether the balancing coefficients were actually 3 and 1 (They might be 6 and 2, 9 and 3, 12 and 4, etc) but you would know that they had to be in a 3 to 1 ratio and that would be enough to relate those two compounds with the correct stoichiometry. a) In Part I of your experiment, potassium carbonate (K,CO3) was the only reactant which contained carbon (C) and strontium carbonate (SrCO3) was the only product…
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DATA/CALCULATION SHEET NAME 1. crucible, cover, BaCl2 2H2O \$,2061 crucible and cover 14.0188g BaCl2 2H2O 4.1873 8 first second third weighing weighing weighing crucible, cover, anhydrous BaCl2 17,5815 H2O lost (use your last weighing) 17.58158 SHOW CALCULATION % water, experimental (See prelab) % water, theoretical SHOW CALCULATION % error
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