Question

How many molecules are in 30 liters of methane (CH4) at STP?

4.033 × 1024



4.033 × 1023



8.06 × 1024



8.06 × 1023

Answer 1

number of moles:

1.0 mole CH4 -------------- 22.4 L
moles ------------- 30 L

moles CH4 = 30 * 1 / 22.4 = 1.339 moles

Therefore:

1.0 mole CH4 --------------- 6.02x10²³ molecules
1.339 moles ---------------- molecules CH4

molecules CH4 = ( 1.339 ) * ( 6.02x10²³ ) / 1.0

=> 8.6x10²³ molecules CH4