Determine the molecular formula for a compound that has the empirical formula
ch2o and a molar mass of 120. grams per mole.

We already know that the molar mass of Carbon (C) is 12.01g/mol, of Hydrogen (H) is 1.008 g/mol, of Oxygen (O) is 16g/mol.

If the molecular formula were exactly the same as the empirical formula, then it would have a molar mass of:
12.01g/mol+ 2*(1.008g/mol)+ 16g/mol= 30.03g/mol

But the actual molar mass of the molecular formula is 120.g/mol, which is 4 times as great as 30.03g/mol! Therefore, we have to multiply the empirical formula by 4, and the molecular formula of the compound is C4H8O4.

Hope this would help :))

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

B. a graduated substance