How many moles are in 4.24kg of na2co3?
hint : you need to convert from kg to grams first
a. 4.00 x 10 -2 moles
b. 40.0 moles
c. 4.49 x 105 moles
d. 2.55 x 1028 moles

40.0 is the answer, sorry, I had some lag, I would've answered it like 5 minutes ago

Hope I helped

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 .