Answer to Question #169057 in General Chemistry for Hong rong Zheng

Question

How many molecules does 43.6 L of methane, CH₄, contain?

Answer 1

We know that 1 mole of any substance contains exactly 22.7 liter of the volume at STP ( standard temperature and pressure) .

Therefore , volume = no. Of moles × 22.7L

43.6 L = no. of moles × 22.7L

no. Of moles = 1.92 moles

We know that 1 mole of any substance contains exactly the 6.022×10²³ molecules

Therefore,

Molecules = no. Of moles × 6.022×10²³

Molecules = 1.92×6.022×10²³

Molecules = 11.56×10²³ CH₄ Molecules