Determine the empirical formula for a compound that comtains 17.9 grams of carbon, 1.680 grams of hydrogen, 4.225 grams of oxygen and 1.228 grams of nitrogen

Gallium melts near room temperature and has one of the largest  liquid  ranges of any metal, so it has found use in high temperature thermometers.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .