Question

a flask contains 4.4g of CO2 gas . calculate:how many moles of co2 gas are present in the sample and how many atoms of o2 are present in the sample.

Answer 1

Molar mass of CO2 = 44g

Number of moles = given mass/molar mass

= 4.4/44= 0.1mole of CO2

Molar mass of O2= 32g

44g of CO2 contains 32g of O2

4.4g of CO2 contains= 32/44 *4.4

. = 3.2g

Number of moles= given mass /molar mass = 3.2g/32g = 0.1 moles

No. of atoms = 6.022*10^23*0.1 = 6.022*10^22 atoms