An element has two naturally ouccring isotopes. The first isotope has a mass of 85 amu and percent abundance is 72.2% and the second isotope has a mass of 87 amu and it is 27.8% abundant. Calculate the average atomic mass of this element to one decimal place given the provided data.

An observation that requires measurement is called quantitative observable or qualitative

What are the chemical names of these compounds? ke: mg3n2: reset next

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.