.A sample of ethane (C2H6) gas has the same
mass as 1.5 x 102° molecules of methane (CH).
How many C2H6 molecules does the sample of
gas contain?
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We know that the number of 1 mole of atoms for any substance is equal to avogadro's number. -Also we are given that the sample of ethane gas (C2H6) has the same mass as 1.5×1020molecules of methane (CH4). Molecular weight of ethane is 30 grams. Mass of 1 molecule of ethane will be equal to 30NA grams.
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