Question

number of particle in CO2 is 3.011 into 10 power 23 find number of moles and mass

Answer 1

Molar mass tells us about the weight of one mole of something. And one mole is 6.022 * 10^23 atmos/molecules (Avogadro's number). So 6.022 * 10^23 Oxygen atoms is 16 g (1 mole * molar mass). In order to answer your question, we need to understand that 1 mole of any substance consists of Avogadro number of particles.