A student is attempting to make up 500.0 mL of a 0.340 M solution of CoCl3 from a stock solution which has a molarity of 4.4 M. How much of the stock solution will they need to add to a 500.0 mL volumetric flask to make up the 0.340 M solution?

The angle of reflection is 30°

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Most elements have more than one naturally occurring isotope. as you learned previously, the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same element, but they have different mass numbers (total number of protons and neutrons) giving them different atomic masses. so which mass is put on the periodic table for each element? is it the most common isotope’s mass? the heaviest mass? this activity will answer that question.