Determine the molecular formula for glucose, with a molar mass of 180 grams, if the empirical formula for glucose is ch2o. ch2o c2h4o2 c3h6o3 c6h12o6

The empirical formula for glucose is the simplest ratio of whole numbers components in the compound. While molecular formula is the actual composition of components in the compound.
Empirical formula has been given. We need to find the mass of one empirical unit
Mass of one empirical unit = CH₂O
                                           = (12 g/mol x1 + 1 g/mol x 2 + 16 g/mol x 1) = 30 g
we need to find how many empirical units are there in the molecular formula 
mass of molecule - 180 g/mol
how many empirical units in 1 molecule - 180 /30 = 6
therefore 6 empirical units =  CH₂O x 6 
molecular formula = C₆H₁₂O₆

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.