6. A sample of limestone weighing mобр g was transferred to a solution, a negligible amount of radioactive 45Ca was added, and the total activity of the solution Atotal was measured. After that, CaSO4 was precipitated, the precipitate (mос) was weighed, and the activity of the precipitate Aос was measured. Determine the mass fraction (%) of CaCO3 in limestone using the following data:
Option 1 2 3 4
mобр, g 0.3023 0.3560 0.3410 0.4105
mос, g 0.2546 0.2872 0.2905 0.3178
Атоль, imp/min 870 914 950 925
Аос, imp/min 816 868 846 886
Solution for option 1
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