Whats the mass of 1 mole of oxygen gas?

The mass of one mole of oxygen atom is about 16 grams ,oxygen gas exist as a molecule (O2) so 1 mole of (O2) is 32 grams

1mole of oxygen = x grams/15.9994

1mole * 15.9994 = x

x = 15.9994g

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 .