**Question:****The expression for a molecular flux is given by**

**where n ^{∗} is a molecular density, and < v > is average molecular velocity.**

**Assume an ideal-gas behavior for the system of gas molecules near a surface at pressure P and temperature T.**

**a) Calculate a function J**

_{N}, the numver of molecules striking a surface of unit area per unit time at these conditions.**b) How many nitrogen molecules will strike a 1.0cm**

^{2}surface in 1.0 s at T=298K and a gas pressure of P = 1.05 × 10^{−6}Pa?

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