Naturally occurring Strontium (Sr) consists of the four stable isotopes below and has an average atomic mass of 87.62 amu. Based on only this data, select the isotope that is MOST abundant, or choose E. if insufficient
information is provided to make a conclusion.
Strontium Isotope Isotopic Mass (amu)
A. Strontium-84 83.9134
B. Strontium-86 85.9092
C. Strontium-87 86.9088
D. Strontium-88 87.9056
E. Cannot determine from information provided.

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]