Q2 of 7 Page 43

A sample of ethane(C2H6) gas has the same mass as 1.5 × 1020 molecules of methane CH4. How many C2H6 molecules does the sample of gas contain?

No. of molecules methane = 1.5 × 1020 Molecules

Mass of one mole of C2H6​ = 30 g


Mass of one mole of CH4​ = 16 g


​1 mole of a substance contains 6.022 ×1023 molecules


Mass of 6.022×1023 molecules of Methane = 16 g


​Mass of 1.5 × 1020 molecules of methane


= = 3.98×10-3


30 g of Ethane contains 6.022×1023 molecules


3.98×10-3 g of ethane will contain


= 0.8×1020 molecules


= 8×1019 molecules


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