The reaction of hydrogen with oxygen produces water. 2H2(g) + O2(8) - 2H2O(g)
a. How many moles of O2 are required to react with 2.6 mol
of H2?
b. How many moles of H, are needed to react with 5.0 mol
of O2?
c. How many moles of H2O form when 2.5 mol of O2
reacts?

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity