How many grams of Ca₃(PO₄)₂ are produced when 126.8 grams of CaCl₂ are reacted?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume