Water and diluted to
A drug with
Formula weight 270 has
a moley absorptivesty of 703 at 270 nm- one
tablet is dissolve in
of a litres. If the absorbence
of
this
solution in the uv region at 270nm
to
equal
0.687
in a 1-cm cell, how
grams of the drug are contained in the tablet
a rolume
many

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

yes the answer is total mass in unchanged   : )