Question

Calculate the mass of CO2 molecules whose number is equal to the number of molecules present in 40g

oxygen.

Answer 1

first of all
no of mole = given mass/ molar mass
no of mole = 40/44

then, no of molecules = 0.9×6.02 ×10^23
= 5.148 × 10^23

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i hope it may help u

Answer 2

5.148 ×10to the power 23