Argon, ar, is a noble gas. how many miles of argon are in 200 gram sample of argon.? (answer rounded to the ones place)

The answer is 39.948 g/mol so rounded to the nearest ones would be 40.00 g/mol.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.