How many moles of methane molecules, CH4, are in 80 grams of methane

Number of mole = 5moles

Explanation:

To find the number of mole of methane,we will use the formula

n = m/ Mm

n - moles

m - mass

Mm - molar mass

Since m - 80g

Let's calculate the molecular weight of CH4

C - 12

H - 1

Mw = 12 + 1 * 4

= 12 + 4

= 16g/mol

n = 80g/16g/mol

n = 5moles

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-