PLEASE HELP Which concept accounts for the whole-number subscripts in chemical formulas?

A. law of multiple proportions

B. Avogadro's law

C. conservation of energy

D. conservation of matter

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

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted