0.05g of impure calcium carbonate was added in 20ml of N/5 (f= 1.05) HCL and the excess of hcl solution required 30 ml of N /10 (f= 1.15 ) NaoH for complete neutralization. Find the percentage purity of CaCo3 .

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

How many atoms are there in 5.70 mol of mg

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist