Based on the half-life of 87Rb, record the time (in billions of years) and the percentage of parent isotopes remaining after 4 half-lives. I need to be able to graph the data for the predicted time (x-axis) versus the percent of parent isotope remaining (y-axis). thanks in advance

What is the formula that this ionic compounds could form sr2+p3-o2-

What is the number of atoms in 3.54 mol s

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]