Question

If 100 cc of a gas A contains Y molecules. How many molecules of gas B will be present in 50 cc of B and of gas C in 25 cc . The gases A, B and C are under the same conditions of temperature and pressure.

• A. 12g of C -12
• B. 32g of sulphur
• C. 32g of oxygen
• D. 12.7g of iodine

Answer 1

The correct option is B 32g of sulphur

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

Therefore, if 100 cc of gas A contains Y molecules then 100 cc of gas B and gas C also Y molecules.

Hence, 50 cc of gas B contains Y/2 molecules and 25 cc of gas C contains Y/4 molecules.