Question

if 150 cc of gas A contains X molecules,how many molecules of gas B will be present in 75 cc of B?the gases A and B are under the same temperature and pressure.

Answer 1

Answer: $\frac{X}{2} molecules$

Explanation:

According to Avogadro's law, equal volume of all gases contain equal number of molecules at same conditions of temperature and pressure.

Thus if 150 cc of gas A contains =X molecules

150 cc of  gas B also  contains = X molecules under the same temperature and pressure.

Then 75 cc of  gas B also  contains =$\frac{X}{150}\times 75=\frac{X}{2} molecules$

Thus $\frac{X}{2}$ molecules of gas B are present under the same temperature and pressure as that of gas A.