A photometer with a linear response to radiation gave a reading of 529 mV with the solvent in the light path and 272 mV when the solvent was replaced by an absorbing solution. The photometer was set to zero with no light striking the detector. Calculate: a. the percent transmittance and absorbance of the absorbing solution.
b. the expected transmittance if the concentration of absorber is one half that of the original solution.
c. the transmittance to be expected if the light path through the original solution is doubled.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

the answers would be

the first one and the second one

a