The standard enthalpy of formation of
gaseous H_2 O at 298 K is −241.82 kJ
mol^(−1) . Estimate its value of 100°C given
the following values of the molar heat
capacities at constant pressure:
H_2 O(g) : 35.58 JK^(−1) mol^(−1) , H_2 (g) :
28.84 J mol^(−1) K^(−1) and O_2 (g) : 29.37 J
mol^(−1) K^(−1) . Assume heat capacity to be
independent of temperature.
A baloon filled with helium rises against
gravity increasing its potential energy.
The speed of the baloon also increases
as it rises. How do you reconcile this
with the law of conservation of
mechanical energy? You can neglect
viscous drag of air and assume that
density of air is constant.
(∣m^2 −n^2 ∣,2mn,m^2 +n^2 ) is pythagorean
triplet for all m,n∈N. This can be
proved easily.Is the vice versa of
the statement is also true?
I-E
If for a,b,c∈N ,a^2 +b^2 =c^2 then there
exist m,n∈N such that m^2 +n^2 =c and
{a,b}={∣m^2 −n^2 ∣,2mn}