how n1t1/p1 =n2t2/p2is derived from the gas equation which is pv=nrt

Dear student,

We have PV = nRT, on rearranging - PV/ nT = R.
If 2 different conditions are given , then we have- P1V1n1T1= P2V2n2T2 ( as R is constant)
If V is constant for given condition then V1 = V2, therefore above equation becomes
P1n1T1=P2n2T2 or n1T1P1=n2T2P2


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