al zami

i tried .lets see... if we declare another coefficient d for co then c8h8+a(o2+3.76n2)----->xco2+yh2o+a*(3.76n2)+dco 8=x+d;..........(1) 2y=18, so y=9; 2a=2x+y+d =>2x+d=2a-9;...........(2) we get 3 variable and two equation.but we need 3 equations to solve for 3 variable...

octane is burnt with 80% air if it is theoritical air ,the equation wiill be C8H18+a(O2+3.76N2)------>xCO2+yH2O+a*(3.76N2) and form that equation we can find the coefficient a,x,y. for x=8; 2y=18, so y=9; 2a=2x+y, so 2a=2*8+9, a=12.5 but when it comes to less than theoritical air there should be co present ,shouldn't it? then what will be the equation c8h8+a(o2+3.76n2)----->xco2+yh2o+a*(3.76n2)+co if i give some coefficient to co my question is how i can find the value coefficient of co here ?

here pressure decreases and volume increases and enthalpy is negetive so that means work is done by the gas no changes in temperature is mentioned its not making any sence.

a math problem goes like this a gas initially at p1=512 kpa and v1=142 litre undergoes a process to p2=172 kpa and v2=274 litre durig which enthalpy decreases 65.4 kj.specific heats are constant,Cv=3.175 kj/kg-k.determine dU,Cp and R. here my question is 1) I cant understand which thermodynamic process is this,isothermal,polytropic or adiabetic.and why??

i ve already solved the problem .thanks

thanks

For Ideal gases, mole fraction=volume fraction thanks!!!!

if we have a mixture of total n mole(say x mole a ,y mole b,z mole c).and x+y+z=n.from there we can find the mole fraction that means moles of each components in 1 mole mixture.then we can multiply each mole fraction with each molecular mass and add them up.and it is called equivalent molecular mass. so my question is does equivalent molecular mass means mass of 1 mole of that mixture with respect to its components???????

what is "equivalent molecular mass " means and how to determine it from mole fraction ????

actually what i need to do for volumetric analysis where mass is given ?????????

a mixture of 4.5kg of o2 and 6.8kg of n2 has a pressure of 3.56 bar and temperature 15 degree.determine the following. 1.volumetric analysis 2.specific gas constant 3.partial pressure of 02 4.density of the mixture****** ***** can you explain me what i need to determine to find the density of the mixture???????????