Consider the reaction below.

na+ + c2h3o2-(aq) + h+ + ci- --> na+ + ci- + hc2h3o2

which is the net ionic equation for the reaction?

a) h+ + ci- --> hci
b) na+ + ci- --> naci
c) na+ + c2h3o2_ --> nac2h3o2
d) c2h3o2-(aq) + h+ --> hc2h3o2

Calculate the number of molecules present in 0.750 mol of mgo.

Imagine that twenty i. u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

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.