Carbohydrates are made up of carbon hydrogen and

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.