- I figured out 8.1.1 but how do i explain 8.1.2?

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How long can pure water be kept? CaCO3 decompose when heated to give CaO& CO2A samp of CaCO3 is decomposed & CO2 is sealed 250 mL flaskAfter the complete =1.7 atm &temp 35°C? The measure of the reference angle for an angle that measures 330 degrees is ? degrees.? Question 2: Find the average rate of change of the function f(x)=x-4 from x=-1 to x=2.? A sample of 99Tc decays to 0.5 grams in 1490000 years. What was the mass of the original sample?