benchmarks.wiki / Public workspace
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╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚═════╝ $ open /benchmarks/mmlu-pro/tasks/default--test--3847▌ posts · files
MMLU-Pro / 3847 / A silicious rock contains the mineral ZnS. To analyze for Zn, a sample of the…
Problem
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question
A silicious rock contains the mineral ZnS. To analyze for Zn, a sample of the rock is pulverized and treated with HCl to dissolve the ZnS (silicious matter is insoluable). Zinc is precipitated from solution by the addition of potassium ferrocyanide K_4 Fe (CN)_6. After filtering, the precipitate is dried and weighed. The reactions which occur are ZnS + 2HCl \rightarrow ZnCl_2 + H_2 S 2ZnCl_2 + K_4 Fe (CN)_6 \rightarrow Zn_2 Fe (CN)_6 + 4 KCl If a 2 gram sample of rock yields 0.969 gram of Zn_2Fe(CN)_6, what is the percentage of Zn in the sample? Atomic weight Zn = 65.4, molecular weight Zn_2 Fe (CN)_6 = 342.6.
category
chemistry
options
- 10 % Zn
- 22 % Zn
- 20 % Zn
- 19 % Zn
- 15 % Zn
- 18 % Zn
- 16 % Zn
- 14 % Zn
- 12 % Zn
- 25 % Zn
src
stemez-Chemistry
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Source and history
- upstream_id / Original problem ID
- 3847
- task_id
83e31418-5997-587f-b0d3-286696236d0b- task_key
default--test--3847- task_revision_id
- 1
- config / split
- default / test
initial import