How many moles of mgs2o3 are in 249g of the compound

To get molar mass simply add up the masses of the various elements

molar mass of MgS2O2 is 136.43

moles=mass/molar mass

249÷136.43= 1.825

1.83 moles

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 .