Question

Two beakers contain equal masses of CCl₄ and PCl₅, respectively. Which beaker contains more molecules?

a) Beaker with CCl₄

b) Beaker with PCl₅

c) Both contain the same number of molecules

d) Cannot be determined without mass values

Answer 1

The beaker with CCl₄ contains more molecules because it has a lower molar mass.

Step-by-step explanation:

The number of molecules in a substance can be determined by using Avogadro's number and the molar mass of the substance. Avogadro's number is used to convert from moles to molecules. The molar mass is the mass of one mole of a substance, and it can be used to determine the number of molecules in a given mass of the substance.

In this case, if the two beakers contain equal masses of CCl₄ and PCl₅, respectively, and given that the molar mass of CCl₄ is less than the molar mass of PCl₅, the beaker with CCl₄ will contain more molecules. This is because a lower molar mass means there are more molecules per gram of substance.