The number of carbon monoxide that are in 10 ml at STP is 2.68 x 10²⁰ molecules
calculation
Step 1 : convert 10 ml to L
convert 10 ml to L = 10/1000 =0.01 L
Step 2: find the moles of CO at STP
That is at STP 1 mole = 22.4 L
?moles = 0.01 L
by cross multiplication
= {0.01 L x 1 mole)/22.4 L} =4.46 x 10⁻⁴ moles
Step 3 ; find the number of molecules of Co using the Avogadro's law constant
that according to Avogadro's law 1 moles = 6.02 x 10²³
4.46 x 10⁻⁴ moles =? molecules
by cross multiplication
= {(4.46 x 10⁻⁴ moles) x( 6.02 x 10²³ molecules) / 1 mole} =2.68 x 10²⁰ molecules