How To Calculate Number Of Molecules?

Convert the given amount to moles

Use the formula: number of molecules = moles × 6.022 × 10^23

If given mass, calculate moles using: moles = mass ÷ molar mass

If given particles, use the particle count directly if already in molecules

If given gas volume at STP, calculate moles using: moles = volume ÷ 22.4 L

Multiply the moles by Avogadro’s number

Write the final answer in molecules