How many moles are in 11.0 grams of methane (CH4)?

If I’m not mistaken it should be 16.04246.

60.0 - there are 3 significant numbers

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).