How many molecules of carbon monoxide are in 10 mL at STP

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