SOLUTION :
4.
P/T = constant for the given volume.
=> P1/T1 = P2/T2
=> P2 = P1 (T2/T1) = 7 * 10^5 ((273+35) / (273+18))
=> P2 = 740893.47 Pa
So, pressure at 35ºC will be 740893.47 Pa (ANSWER).
5.
PV = N Kb T
=> 1*10^(-10) * 1.0 * 10^(-9) = N * 1.38*10^(-23) * (273+20)
=> 1 * 10^(-19) = 4.0434*10^(-21) * N
=> N = 1 * 10^(-19) / (4.0434 * 10^(-21)) = 24.73 molecules
So, 24.73 molecules are there in 1 cubic mm volume. (ANSWER).
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